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 A023632 #3 Mar 30 2012 18:55:53 %S A023632 2,3,4,2,4,2,2,4,4,2,2,4,4,4,2,2,4,2,2,4,4,4,2,2,4,2,2,4,2,2,4,4,4,2, %T A023632 2,4,4,4,2,2,4,2,2,4,2,2,4,4,4,2,2,4,4,4,2,2,4,4,4,2,2,4,2,2,4,2,2,4, %U A023632 4,4,2,2,4,2,2,4,2,2,4,4,4,2,2,4,4,4,2,2,4,4,4,2,2,4,2,2,4,2,2 %N A023632 a(n) = s(2n+1) - s(2n), where s( ) is sequence A023631. %K A023632 nonn %O A023632 1,1 %A A023632 _Clark Kimberling_