This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A074896 #11 Aug 07 2022 07:53:39
%S A074896 1,4,9,18,46,52,61,63,94,121,144,148,163,169,423,441,484,487,522,526,
%T A074896 652,675,676,691,925,927,961,982,1042,1062,1089,1251,1273,1297,1405,
%U A074896 1426,1656,1674,1828,1843,1861,4032,4069,4072,4201,4264,4276,4441,4477
%N A074896 Squares written backwards and sorted, duplicates removed.
%H A074896 David A. Corneth, <a href="/A074896/b074896.txt">Table of n, a(n) for n = 1..10000</a>
%e A074896 163 is in the sequence as it is 19^2 = 361 written backwards. - _David A. Corneth_, Aug 06 2022
%o A074896 (PARI) uptoqdigits(n) = {my(res = List()); forstep(i = 1, sqrtint(10^n), [1,1,1,1,1,1,1,1,2], listput(res, fromdigits(Vecrev(digits(i^2))))); Set(res)} \\ _David A. Corneth_, Aug 06 2022
%Y A074896 Cf. A002942.
%K A074896 nonn,easy,base
%O A074896 1,2
%A A074896 _Jason Earls_, Sep 14 2002