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 A048562 #8 Oct 15 2019 11:57:30 %S A048562 3,31,3101,31010001,3101000100000001,9806223340409913487644162249555, %T A048562 310100010000000100000000000000014337285304591730671503423653032 %N A048562 a(n+1)^2 is next smallest nontrivial square beginning with a(n)^2, initial square is 9. %C A048562 Next terms are 126, 251 and 502 digits long. %Y A048562 Cf. A048561. %K A048562 nonn,base %O A048562 0,1 %A A048562 _Patrick De Geest_, May 15 1999