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 A377584 #3 Nov 02 2024 05:22:39
%S A377584 1,1,1,5,23,167,907,8647,84625,840401,8917289,122748749,1753750759,
%T A377584 26047588855,401961006787,6422475692063,124830139084193,
%U A377584 2445151343123873,48495757104590545,1038849234759346069,23966120552360409271,545230613480963786951,13288745250263697838331
%N A377584 E.g.f.: exp(Sum_{k>=1} A326305(k) * x^k/k).
%F A377584 a(n) ~ sqrt(3) * exp(3*sqrt(2*n)/Pi - n) * n^(n - 1/4) / (2^(3/4) * sqrt(Pi)).
%t A377584 nmax = 25; CoefficientList[Series[Exp[Sum[If[OddQ[k], EulerPhi[k], EulerPhi[k] - EulerPhi[k/2]]*x^k/k, {k, 1, nmax}]], {x, 0, nmax}], x] * Range[0, nmax]!
%Y A377584 Cf. A326305.
%K A377584 nonn
%O A377584 0,4
%A A377584 _Vaclav Kotesovec_, Nov 02 2024