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 A331559 #6 Jan 26 2020 09:46:14
%S A331559 0,1,2,9,44,280,2064,17738,172528,1880856,22686960,300193872,
%T A331559 4323063744,67323469200,1127433161568,20205636981840,385897245967104,
%U A331559 7824675262660608,167885148101916672,3800289634376282496,90513807325761507840,2262830879094971399424
%N A331559 E.g.f.: -log(1 + x + log(1 - x)).
%C A331559 Logarithmic transform of A226226.
%F A331559 a(n) ~ (n-1)! / (1 + LambertW(-exp(-2)))^n. - _Vaclav Kotesovec_, Jan 26 2020
%t A331559 nmax = 22; CoefficientList[Series[-Log[1 + x + Log[1 - x]], {x, 0, nmax}], x] Range[0, nmax]! // Rest
%Y A331559 Cf. A003713, A032181, A052808, A052832, A226226, A331558.
%K A331559 nonn
%O A331559 1,3
%A A331559 _Ilya Gutkovskiy_, Jan 20 2020