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 A326884 #6 Jul 31 2019 12:30:28
%S A326884 1,1,5,43,377,4291,58745,914803,15641897,298104451,6337624985,
%T A326884 147137420563,3674045105417,98093008751011,2793940490888825,
%U A326884 84812168406518323,2737609202984488937,93486719521251467971,3358396276982001106265,126434158646122122080083
%N A326884 E.g.f.: Product_{k>=1} (1 + k*(exp(x)-1)^k).
%H A326884 Vaclav Kotesovec, <a href="/A326884/b326884.txt">Table of n, a(n) for n = 0..410</a>
%F A326884 a(n) = Sum_{k=0..n} A022629(k)*Stirling2(n,k)*k!.
%t A326884 nmax = 20; CoefficientList[Series[Product[(1+k*(Exp[x]-1)^k), {k, 1, nmax}], {x, 0, nmax}], x] * Range[0, nmax]!
%Y A326884 Cf. A022629, A305550, A305987, A326885.
%K A326884 nonn
%O A326884 0,3
%A A326884 _Vaclav Kotesovec_, Jul 31 2019