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 A059655 #2 May 01 2014 02:46:11 %S A059655 1,5,9,15,19,23,27,37,41,45,49,55,59,63,67,73,77,81,85,89,95,99,103, %T A059655 107,113,117,121,125,135,139,143,147,153,157,161,165,175,179,183,187, %U A059655 193,197,201,205,215,219,223,227,233,237,241,245,255,259,263,267,273 %N A059655 Positions of minus ones (-1's) in A059652. %C A059655 Are these always odd? Is there any real periodicity? %Y A059655 First differences: A059656. %K A059655 nonn %O A059655 1,2 %A A059655 _Antti Karttunen_, Feb 03 2001