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 A057551 #2 May 01 2014 02:48:30 %S A057551 2,4,1,9,1,2,1,1,23,1,2,1,1,4,1,2,1,1,2,1,1,1,65,1,2,1,1,4,1,2,1,1,2, %T A057551 1,1,1,9,1,2,1,1,4,1,2,1,1,2,1,1,1,4,1,2,1,1,2,1,1,1,2,1,1,1,1,197,1, %U A057551 2,1,1,4,1,2,1,1,2,1,1,1,9,1,2,1,1,4,1,2,1,1,2,1,1,1,4,1,2,1,1,2,1,1,1,2,1 %N A057551 First differences of A057548. %Y A057551 Terms a(A014138[n]) seem to give A014137[n+2]. Cf. A057550. %K A057551 nonn %O A057551 0,1 %A A057551 _Antti Karttunen_, Sep 07 2000