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 A156729 #4 Jan 03 2014 15:51:17 %S A156729 0,0,1,0,0,0,1,0,0,1,0,1,0,0,0,1,0,1,0,0,1,0,1,0,0,0,1,0,0,1,0,0,0,1, %T A156729 0,1,0,1,0,0,0,0,1,0,1,0,0,0,0,1,0,1,0,1,0,0,0,1,0,0,1,0,0,1,0,0,0,1, %U A156729 0,0,1,0,1,0,0,0,1,0,1,0,0,0,0,1,0,1,0,1,0,0,1,0,1,0,0,0,1,0,1,0,0,1,0,0,1 %N A156729 a(n)=(v(2*n+2)-v(2*n))/2 where v(n)=A156253(n)-A156251(n). %Y A156729 Cf. A054354 %K A156729 nonn %O A156729 1,1 %A A156729 _Benoit Cloitre_, Feb 14 2009