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 A220657 #4 Dec 19 2012 12:02:44 %S A220657 0,1,3,6,9,12,15,19,23,27,31,35,39,43,47,51,55,59,63,67,71,75,79,83, %T A220657 87,92,97,102,107,112,117,122,127,132,137,142,147,152,157,162,167,172, %U A220657 177,182,187,192,197,202,207,212,217,222,227,232,237,242,247,252,257 %N A220657 Partial sums of A084558+1. %C A220657 Auxiliary function for computing A220658 and A220659. %o A220657 (Scheme with _Antti Karttunen_'s intseq-library): (define A220657 (PARTIALSUMS 1 0 (COMPOSE 1+ A084558))) %K A220657 nonn %O A220657 0,3 %A A220657 _Antti Karttunen_, Dec 18 2012