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 A038679 #4 Mar 31 2012 13:19:58 %S A038679 3,14,59,242,982,3964,15955,64106,257282,1031780,4135518,16569204, %T A038679 66365964,265761016,1064046979,4259609626,17050224394,68241838036, %U A038679 273110643754,1092947507356,4373580244084,17500703480776 %N A038679 Convolution of A007054 (Super ballot numbers) with A000302 (powers of 4). %C A038679 Also: convolution of A038665 with A000984 (central binomial coefficients ) %F A038679 a(n) = 4^(n+1) - C(n+1), C(n): Catalan numbers A000108; G.f. c(x)*(4-c(x))/(1-4*x), where c(x) = g.f. for Catalan numbers. %Y A038679 A007054, A000302, A000108, A038665, A000984. %K A038679 easy,nonn %O A038679 0,1 %A A038679 _Wolfdieter Lang_