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 A294260 #13 Oct 27 2017 13:10:15
%S A294260 1,-1,-1,5,1,79,-689,2981,-7615,-172801,3621151,-16469531,-240199871,
%T A294260 2722511375,51840080111,-1987808959291,12337235928961,136594696115071,
%U A294260 -1167414675803585,-56631124939839931,-1376838916423621759,69766591820556094799
%N A294260 E.g.f.: exp(Sum_{n>=1} A010815(n)*x^n).
%H A294260 Seiichi Manyama, <a href="/A294260/b294260.txt">Table of n, a(n) for n = 0..449</a>
%F A294260 a(0) = 1 and a(n) = (n-1)! * Sum_{k=1..n} k*A010815(k)*a(n-k)/(n-k)! for n > 0.
%Y A294260 Main diagonal of A294254.
%Y A294260 Cf. A293840.
%K A294260 sign
%O A294260 0,4
%A A294260 _Seiichi Manyama_, Oct 26 2017