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 A059659 #2 May 01 2014 02:46:11 %S A059659 1,4,5,8,10,13,16,17,20,22,25,27,28,31,32,35,39,43,44,47,51,54,56,59, %T A059659 62,66,68,71,74,77,78,81,83,85,86,89,90,93,97,101,102,104,105,108,112, %U A059659 114,117,120,124,127,129,131,132,135,136,139,141,143,144,147,148,151 %N A059659 Positions of minus ones (-1's) in A059651. %Y A059659 First differences: A059660. %K A059659 nonn %O A059659 1,2 %A A059659 _Antti Karttunen_, Feb 03 2001