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 A215709 #11 Sep 22 2015 10:15:06 %S A215709 1,1,4,24,172,1420,13968,154336,1914288,26108208,388596960,6251899104, %T A215709 108088087776,1995840455232,39183950494752,814399382073120, %U A215709 17856182764554240,411671923447488768,9952212794293198080,251646630845685827328,6640389412581544588800 %N A215709 n-th derivative of (x^x)^((x^x)^x) at x=1. %C A215709 Also n-th derivative of (x^((x^x)^x))^x = x^(x^(x^2)*x) at x=1. %H A215709 Alois P. Heinz, <a href="/A215709/b215709.txt">Table of n, a(n) for n = 0..400</a> %F A215709 E.g.f.: (x+1)^((x+1)^(x^2+2*x+2)). %p A215709 a:= n-> n!*coeff(series(subs(x=x+1, x^(x^(x^2)*x) ), x, n+1), x, n): %p A215709 seq(a(n), n=0..25); %Y A215709 Column k=12 of A215703. %Y A215709 Cf. A005727, A179230, A179405, A215524. %K A215709 nonn %O A215709 0,3 %A A215709 _Alois P. Heinz_, Aug 21 2012