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 A327034 #10 Dec 03 2019 04:23:02
%S A327034 1,1,2,4,14,46,242,1114,7814,46246,405482,2933074,30860414,263817646,
%T A327034 3238391522,31943268634,448122565814,5009616448246,79063212894362,
%U A327034 987840438629794,17322647732052014,239217148602642046,4614370558369770002,69790939492563608554
%N A327034 Expansion of e.g.f. exp(x) / (2 - cosh(x)).
%F A327034 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^k * binomial(n,k) * (2^(k - 1) - 2) * a(n-k).
%F A327034 a(n) ~ n! * (7 + 4*sqrt(3) + (-1)^n) / ((3+2*sqrt(3)) * (log(2+sqrt(3)))^(n+1)). - _Vaclav Kotesovec_, Dec 03 2019
%t A327034 nmax = 23; CoefficientList[Series[Exp[x]/(2 - Cosh[x]), {x, 0, nmax}], x] Range[0, nmax]!
%Y A327034 Cf. A081557, A094088, A330046.
%K A327034 nonn
%O A327034 0,3
%A A327034 _Ilya Gutkovskiy_, Nov 28 2019