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 A344217 #7 May 12 2021 06:19:26
%S A344217 0,1,4,17,69,204,-330,-12510,-110250,-42840,16760520,332942400,
%T A344217 3258208800,-13239903600,-1299112214400,-28283225770800,
%U A344217 -232265443410000,6756753459456000,338710300424496000,7139034325607184000,19827438602379408000,-4654590583125843360000
%N A344217 Expansion of e.g.f. log(1 + (1/(1-x)^4 - 1)/4).
%F A344217 a(n) ~ -2*(n-1)! * cos(n*arctan(1/(1 - sqrt(2)*3^(1/4)))) / (1 + 1/sqrt(3) - sqrt(2)/3^(1/4))^(n/2).
%t A344217 nmax = 25; CoefficientList[Series[Log[1 + (1/(1 - x)^4 - 1)/4], {x, 0, nmax}], x] * Range[0, nmax]!
%Y A344217 Column k=4 of A308497.
%K A344217 sign
%O A344217 0,3
%A A344217 _Vaclav Kotesovec_, May 12 2021