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 A354066 #6 May 17 2022 07:25:55
%S A354066 1,-2,-2,8,-24,224,-720,-1408,0,717824,-3628800,-47546368,-479001600,
%T A354066 12431673344,87178291200,-68669145088,-20922789888000,47215125069824,
%U A354066 -6402373705728000,-159504062197792768,2432902008176640000,102176932845365755904,-1124000727777607680000
%N A354066 Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + tanh(x).
%F A354066 E.g.f.: Sum_{k>=1} mu(k) * log(1 + tanh(x^k)) / k.
%t A354066 nmax = 23; CoefficientList[Series[Sum[MoebiusMu[k] Log[1 + Tanh[x^k]]/k, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]! // Rest
%Y A354066 Cf. A000182, A353779, A353912, A354055, A354056, A354063, A354064, A354065.
%K A354066 sign
%O A354066 1,2
%A A354066 _Ilya Gutkovskiy_, May 16 2022