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 A048558 #7 Jan 20 2017 19:56:05 %S A048558 1,4,13,412,130286,41200050724,4120005072400000000001, %T A048558 41200050724000000000010000000000000000000001, %U A048558 4120005072400000000001000000000000000000000100000000000000000000000000000000000000000001 %N A048558 a(n+1)^2 is next smallest nontrivial square beginning with a(n)^2, initial square is 1. %C A048558 Next terms are 176 and 351 digits long. %Y A048558 Cf. A048557. %K A048558 nonn,base %O A048558 0,2 %A A048558 _Patrick De Geest_, May 15 1999