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 A028818 #6 Aug 11 2024 14:41:29 %S A028818 676,69696,94249,5221225,6948496,522808225,617323716,942060249, %T A028818 1086078706801,1615108015161,4051154511504,5265533355625, %U A028818 9420645460249,123862676268321,144678292876441,165551171155561,900075181570009,94206450305460249 %N A028818 Palindromic squares with odd number of digits and non-palindromic and "non-core" square roots. %H A028818 P. De Geest, <a href="https://www.worldofnumbers.com/subsquar.htm">Subsets of Palindromic Squares</a> %Y A028818 Cf. A016106. %K A028818 nonn,base %O A028818 1,1 %A A028818 _Patrick De Geest_