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 A262688 #7 Oct 03 2015 08:48:06 %S A262688 0,1,2,13,18,39,354,355,652,1309,1310,2227,4976 %N A262688 a(n) = square root of the index where A262680 reaches n for the first time. %C A262688 Natural numbers whose squares set new records for A262680. %C A262688 Even and odd terms alternate. %F A262688 a(n) = A000196(A262687(n)). %o A262688 (PARI) \\ See A262687. %o A262688 (Scheme) (define (A262688 n) (A000196 (A262687 n))) %Y A262688 Cf. A000196, A262680, A262687, A262515. %K A262688 nonn,more %O A262688 0,3 %A A262688 _Antti Karttunen_, Oct 03 2015