Issues with scraping a website with paging in python

I am experiencing issues with scraping a website that has paging in it, showing thousands of records that I need to read.
When I scrape the main URL, I get the first 50 results. However, when I add the paging to the URL, the content of the page is returned without the relevant records at all, as if adding the paging to the URL is breaking something.

If I take the exact URL and put it in the browser, I see the results, and if I view the page source, I see the results as well.

Main URL: http://www.camp.bicnirrh.res.in/seqDb.php

URL with paging: http://www.camp.bicnirrh.res.in/seqDb.php?page=15

My code below.
What am I missing?

My code:

lstCAMP_IDs = []
for i in range(1, 500):
    url = f'http://www.camp.bicnirrh.res.in/seqDb.php?page={i}'
    r = requests.get(url)
    try:
        content = r.content.decode("utf-8")
    except Exception as e:
        print(e)
        print(i)
    ampAccnPrec = re.findall("(CAMPSQ[0-9]+)", content)
    if ampAccnPrec == None:
        print(i, "error ampAccnPrec")
        ampAccn = ""
        continue
    else:
        lstCAMP_IDs.append(ampAccnPrec)

You need cookies to traverse pages, so the best way to scrape it is to create a session. And, you need to start at page 0, not 1.

Here's the updated code

import re
import requests

session = requests.session()
lstCAMP_IDs = []
for i in range(0, 500):
	url = f'http://www.camp.bicnirrh.res.in/seqDb.php?page={i}'
	r = session.get(url)
	
	try:
		content = r.content.decode('utf-8')
	except Exception as e:
		print(e)
		print(i)

	ampAccnPrec = re.findall("CAMPSQ[0-9]+", content)
	if ampAccnPrec == None:
		print(i, "error ampAccnPrec")
		ampAccn = ""
		continue
	else:
		lstCAMP_IDs.append(ampAccnPrec)
		print(lstCAMP_IDs)

Got these sequences from the first page, which is page 0.

[['CAMPSQ12088', 'CAMPSQ12088', 'CAMPSQ12089', 'CAMPSQ12089', 'CAMPSQ12090', 'CAMPSQ12090', 'CAMPSQ12091', 'CAMPSQ12091', 'CAMPSQ12092', 'CAMPSQ12092', 'CAMPSQ12093', 'CAMPSQ12093', 'CAMPSQ12094', 'CAMPSQ12094', 'CAMPSQ12095', 'CAMPSQ12095', 'CAMPSQ12096', 'CAMPSQ12096', 'CAMPSQ12097', 'CAMPSQ12097', 'CAMPSQ12098', 'CAMPSQ12098', 'CAMPSQ12099', 'CAMPSQ12099', 'CAMPSQ12100', 'CAMPSQ12100', 'CAMPSQ12101', 'CAMPSQ12101', 'CAMPSQ12102', 'CAMPSQ12102', 'CAMPSQ12103', 'CAMPSQ12103', 'CAMPSQ12104', 'CAMPSQ12104', 'CAMPSQ12105', 'CAMPSQ12105', 'CAMPSQ12106', 'CAMPSQ12106', 'CAMPSQ12107', 'CAMPSQ12107', 'CAMPSQ12108', 'CAMPSQ12108', 'CAMPSQ12345', 'CAMPSQ12345', 'CAMPSQ12346', 'CAMPSQ12346', 'CAMPSQ12347', 'CAMPSQ12347', 'CAMPSQ12348', 'CAMPSQ12348']]