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 A067983 #4 Mar 31 2012 13:20:07 %S A067983 11,51,127,283,580,1138,2163,4021,7349,13255,23654,41844,73483,128247, %T A067983 222635,384707,662072,1135334,1940691,3307865,5623681,9538511, %U A067983 16144282,27271848,45987275,77419323,130137943 %N A067983 Convolution of L(n+1) := A000204(n+1) (Lucas), n>=0, with L(n+5), n>=0. %C A067983 Fifth diagonal of triangle A067979. Fifth column of triangle A067990. %F A067983 a(n)= sum(L(k+1)*L(n+5-k), k=0..n) = (18*n+11)*F(n+1)+11*(n+1)*F(n), with F(n) := A000045(n) (Fibonacci). %F A067983 G.f.: (11+7*x)*(1+2*x)/(1-x-x^2)^2. %K A067983 nonn,easy %O A067983 0,1 %A A067983 _Wolfdieter Lang_, Feb 15 2002