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 A290701 #14 Aug 10 2017 06:45:07
%S A290701 2,-6,6,10,-30,-42,238,306,-2790,-3410,45606,53898,-993902,-1146810,
%T A290701 27887070,31605346,-979901046,-1095183522,42166810390,46605422010,
%U A290701 -2181617832702,-2389390959626,133636947954126,145257552124050,-9566483624198150,-10331802314134002
%N A290701 a(n) = Sum_{k=1..n-1} binomial(n, k)*G_n*G_{n-k} where G_n is the n-th Genocchi number (of the first kind).
%H A290701 Seiichi Manyama, <a href="/A290701/b290701.txt">Table of n, a(n) for n = 2..549</a>
%H A290701 Wikipedia, <a href="http://en.wikipedia.org/wiki/Genocchi_number">Genocchi number</a>
%F A290701 a(n) = 2*n*A036968(n-1) + 2*(n-1)*A036968(n).
%Y A290701 Cf. A036968.
%K A290701 sign
%O A290701 2,1
%A A290701 _Seiichi Manyama_, Aug 09 2017