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 A365438 #10 Nov 08 2023 07:51:15
%S A365438 1,1,3,20,216,3214,60940,1405088,38165904,1193631360,42244603368,
%T A365438 1669171435392,72834612333120,3478615044283872,180496518526631424,
%U A365438 10110668949900238848,608110470593816945664,39086875354688578492416,2673826803093451383429120
%N A365438 E.g.f. satisfies A(x) = 1 - log(1 - x*A(x)^2)/A(x).
%F A365438 a(n) = Sum_{k=0..n} (2*n-k)!/(2*n-2*k+1)! * |Stirling1(n,k)|.
%o A365438 (PARI) a(n) = sum(k=0, n, (2*n-k)!/(2*n-2*k+1)!*abs(stirling(n, k, 1)));
%Y A365438 Cf. A138013, A365546.
%K A365438 nonn
%O A365438 0,3
%A A365438 _Seiichi Manyama_, Nov 08 2023