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 A050633 #12 Oct 15 2019 00:02:22 %S A050633 3,7,43,136,10158,85927342,738024797793593 %N A050633 a(1)=3; for n>1, a(n)^2 is next smallest nontrivial square containing a(n-1)^2 as a substring. %F A050633 a(n) = sqrt(A050632(n)). %Y A050633 Starting with a(2)=7, the sequence is identical to A050631. %Y A050633 Cf. A050632, A048562, A050639. %K A050633 nonn,base,more %O A050633 1,1 %A A050633 _Patrick De Geest_, Jul 15 1999 %E A050633 a(7) from _Max Alekseyev_, Feb 15 2012