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 A094408 #5 Feb 22 2013 14:39:03
%S A094408 1,1,4,37,631,17266,692785,38325925,2795925136,260056965205,
%T A094408 30038178784699,4218296308789630,707778995370264001,
%U A094408 139840360858571766121
%N A094408 a(n) = Sum_{k = 0..n} 3^k*A085707(n,k).
%C A094408 Sum_{k = 0..n} x^k*A085707(n,k) give A006846(n), A005647(n), A000364(n) for x = 1, 2, 4 respectively.
%Y A094408 Cf. A085707.
%K A094408 easy,nonn
%O A094408 0,3
%A A094408 _Philippe Deléham_, Jun 04 2004