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 A371229 #10 Mar 16 2024 11:56:45
%S A371229 1,0,2,3,104,630,19944,259560,8718464,185086944,6914815200,
%T A371229 206059083120,8700740615808,332779651158240,15916427365716864,
%U A371229 738672634596405600,39847940942657495040,2163098542598925281280,130682368989193123952640
%N A371229 E.g.f. satisfies A(x) = 1 - x*A(x)^2*log(1 - x*A(x)^2).
%F A371229 a(n) = n! * (2*n)! * Sum_{k=0..floor(n/2)} |Stirling1(n-k,k)|/( (n-k)! * (2*n-k+1)! ).
%o A371229 (PARI) a(n) = n!*(2*n)!*sum(k=0, n\2, abs(stirling(n-k, k, 1))/((n-k)!*(2*n-k+1)!));
%Y A371229 Cf. A371227, A371228, A371230.
%Y A371229 Cf. A371121, A371231.
%Y A371229 Cf. A370993.
%K A371229 nonn
%O A371229 0,3
%A A371229 _Seiichi Manyama_, Mar 15 2024