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 A113723 #4 Mar 02 2015 16:08:50 %S A113723 1,1,3,15,135,3845,769605,3821696361 %N A113723 The number of terms in row n of A113722 when interpreted as a triangle. %C A113723 A113722 is a variant of Golomb's sequence using odd numbers: a(n) is the number of times 2*n+1 occurs, starting with a(1) = 1. %Y A113723 Cf. A001462 (Golomb's sequence), A113722, A113724, A113725, A113676. %K A113723 nonn %O A113723 1,3 %A A113723 _Floor van Lamoen_ and _Paul D. Hanna_, Nov 08 2005