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 A050629 #9 Oct 15 2019 00:03:27 %S A050629 1,4,13,237,6013,3655347,6491041181267 %N A050629 a(n+1)^2 is next smallest nontrivial square containing a(n)^2 as a substring, initial term is 1. %F A050629 a(n) = sqrt(A050628(n)). %Y A050629 Cf. A050628, A048558, A050631, A050633, A050635. %K A050629 nonn,base,more %O A050629 1,2 %A A050629 _Patrick De Geest_, Jul 15 1999 %E A050629 a(7) from _Max Alekseyev_, Feb 15 2012