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 A377425 #11 Oct 28 2024 08:43:40
%S A377425 1,2,24,572,20788,1021892,63498116,4776128772,422019084132,
%T A377425 42854861672612,4918270207805188,629575456637707076,
%U A377425 88938171122678982692,13744507646644260776292,2306659049841490720035780,417774877069420589127228164,81222489094387608969950071780
%N A377425 E.g.f. satisfies A(x) = 1/(2 - exp(x*A(x)^2))^2.
%F A377425 E.g.f.: B(x)^2, where B(x) is the e.g.f. of A377424.
%F A377425 a(n) = (2/(4*n+2)!) * Sum_{k=0..n} (4*n+k+1)! * Stirling2(n,k).
%o A377425 (PARI) a(n) = 2*sum(k=0, n, (4*n+k+1)!*stirling(n, k, 2))/(4*n+2)!;
%Y A377425 Cf. A367134, A376389.
%Y A377425 Cf. A377424, A377428.
%K A377425 nonn
%O A377425 0,2
%A A377425 _Seiichi Manyama_, Oct 28 2024