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 A136039 #3 Mar 30 2012 16:50:47 %S A136039 1,2,23,684,34760,2493096,228253267,25091028820,3179942075960, %T A136039 451649016238160,70421753109861592,11869050034269797984, %U A136039 2136758627313217104448 %N A136039 Bisection of A138551. %K A136039 nonn %O A136039 0,2 %A A136039 _N. J. A. Sloane_, Mar 25 2008