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 A291214 #6 Aug 21 2017 17:24:06
%S A291214 1,112,5868,250128,10020912,399379728,16255733440,684615750832,
%T A291214 30031767680256,1376568893633760,66017645596167168,
%U A291214 3313241694194681184,173934275433107845120,9543378596912872361440,546711252967087466397696,32663132242303127521217184
%N A291214 Column 2 of triangle A290580.
%H A291214 Vaclav Kotesovec, <a href="/A291214/b291214.txt">Table of n, a(n) for n = 1..77</a>
%F A291214 a(n) ~ c * n^(n+5), where c = (exp(1) + 8*exp(3) + 14*exp(5) - 8*exp(7) + exp(9))/512 = 3.06876067343310165753640903985063833178947434...
%o A291214 (PARI) /* As column 2 of triangle A290580 */
%o A291214 { A290580(n, k) = my(W=1, E=1, S=x, C=1, D=1); for(i=0, n,
%o A291214 S = intformal(C*D +x*O(x^n)) ;
%o A291214 C = 1 - intformal(S*D) ; D = 1 - m*intformal(S*C) ;
%o A291214 E = subst( (1 + S)/C, m, 1-m) ) ;
%o A291214 for(i=0, n, W = subst(E, x, x*W));
%o A291214 n!*polcoeff(polcoeff(W, n, x), k, m) }
%o A291214 for(n=1, 25, print1( A290580(n+4, 2), ", ")) \\ after _Paul D. Hanna_
%Y A291214 Cf. A290580, A290581.
%K A291214 nonn
%O A291214 1,2
%A A291214 _Vaclav Kotesovec_, Aug 21 2017