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 A125783 #3 Mar 30 2012 18:37:02 %S A125783 1,4,14,52,217,1033,5604,34416,237328,1822753,15473117,144165763, %T A125783 1464992791,16144683412,191967912402,2451561765083,33487399558154, %U A125783 487448547177703,7535687673952024,123349262218035648 %N A125783 Column 3 of table A125781; also, equals column 1 of matrix power A091351^2. %C A125783 Column k of triangle A091351 = row sums of matrix power A091351^k for k>=0. %F A125783 a(n) = A091352(n+2) - A091352(n+1) - 1. %Y A125783 Cf. A091351; other columns: A091352, A125782, A125784, A125785, A125786. %K A125783 nonn %O A125783 0,2 %A A125783 _Paul D. Hanna_, Dec 09 2006