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 A029995 #18 Feb 10 2025 21:30:50
%S A029995 0,1,4,100,400,6724,8281,10000,26896,532900,672400,2131600,43059844,
%T A029995 44129449,45212176,53290000,54479161,55681444,172239376,186104164,
%U A029995 186595600,203946961,2921402500,3486902500,3583219600
%N A029995 Squares which are palindromes in base 9.
%H A029995 Vincenzo Librandi, <a href="/A029995/b029995.txt">Table of n, a(n) for n = 1..52</a>
%H A029995 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a>
%t A029995 pal9Q[n_]:=Module[{idn9=IntegerDigits[n,9]},idn9==Reverse[idn9]]; Select[ Range[0,60000]^2,pal9Q] (* _Harvey P. Dale_, Nov 12 2011 *)
%Y A029995 Cf. A002779, A029734, A029738, A029806, A029983, A029985, A029987, A029989, A029991, A029993, A029997, A029999, A030074, A030075.
%K A029995 nonn,base
%O A029995 1,3
%A A029995 _Patrick De Geest_