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 A376327 #5 Sep 20 2024 15:37:18
%S A376327 0,1,2,15,112,1285,17616,299299,5946368,136497897,3544641280,
%T A376327 102858065431,3297199331328,115730076038317,4414151526557696,
%U A376327 181797547951527915,8040649885153755136,380100842138029431121,19125314442962053300224,1020539634854353310016415,57563650890815727219507200
%N A376327 Expansion of e.g.f. -LambertW(-x/(1-x^2)).
%F A376327 a(n) ~ (1 + 4*exp(-2))^(1/4) * 2^n * n^(n-1) / (exp(n) * (sqrt(4 + exp(2)) - exp(1))^n).
%t A376327 nmax=25; CoefficientList[Series[-LambertW[-x/(1-x^2)], {x, 0, nmax}], x] * Range[0, nmax]!
%Y A376327 Cf. A052871, A376106.
%K A376327 nonn
%O A376327 0,3
%A A376327 _Vaclav Kotesovec_, Sep 20 2024