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 A139816 #2 Mar 30 2012 18:51:58 %S A139816 1,2,3,9,14,48,75,275,429,1638 %N A139816 Final nonzero terms in rows of A139801. %F A139816 First bisection a(2n) = 1, 3, 14, 75, 429, ... =A026004. %K A139816 nonn %O A139816 0,2 %A A139816 _Paul Curtz_, Jun 14 2008