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 A143640 #11 Dec 20 2014 13:50:52
%S A143640 1,1,3,40,829,26096,1216327,76192824,6123167801,615764308672,
%T A143640 75666884850091,11126407433017944,1925795142055097557,
%U A143640 387184416676122044032,89407267196505737775311,23480531627128442036603416,6953687155109949099972629873
%N A143640 E.g.f. satisfies: A(x) = exp(x*A(((x+1)^9-1)/9)).
%H A143640 Alois P. Heinz, <a href="/A143640/b143640.txt">Table of n, a(n) for n = 0..100</a>
%p A143640 A:= proc(n,k::nonnegint) option remember; if n<=0 or k=0 then 1 else A(n-1,k)(((x+1)^k-1)/k) fi; unapply(convert(series(exp(x*%), x,n+1), polynom), x) end: a:= n-> coeff(A(n,9)(x), x,n)*n!: seq(a(n), n=0..20);
%t A143640 A[n_, k_] := Module[{f}, f[x_] = If[n <= 0 || k == 0, 1, A[n-1, k][((x+1)^k-1)/k]]; Normal[Series[Exp[x*f[x]], { x, 0, n+1}]] /. x -> #]&; a[n_] := Coefficient[A[n, 9][x], x, n]*n!; Table[a[n], {n, 0, 21}] (* _Jean-François Alcover_, Feb 14 2014, after Maple *)
%Y A143640 Cf. 9th column of A143632.
%K A143640 nonn
%O A143640 0,3
%A A143640 _Alois P. Heinz_, Aug 27 2008