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 A118342 #3 Mar 30 2012 18:36:56
%S A118342 1,3,15,85,519,3330,22135,151089,1052805,7458236,53554548,388913046,
%T A118342 2851368587,21076979445,156907929177,1175381112901,8853057357159,
%U A118342 67007699270040,509390314298820,3887605401119964,29775366104932044
%N A118342 Self-convolution cube of A108447.
%o A118342 (PARI) {a(n)=polcoeff((serreverse(x*(1-x+sqrt((1-x)*(1-5*x)+x*O(x^n)))/2/(1-x))/x)^3,n)}
%Y A118342 Cf. A108447, A118341, A118343.
%K A118342 nonn
%O A118342 0,2
%A A118342 _Paul D. Hanna_, Apr 25 2006