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 A215708 #12 Sep 22 2015 10:12:47 %S A215708 1,1,4,24,148,1180,10428,106876,1198160,14843808,198832320,2877693984, %T A215708 44545268832,734929736736,12852051257472,237372559264320, %U A215708 4614124211454720,94103610003019008,2008507968212696064,44748953208031094784,1038646472528272158720 %N A215708 n-th derivative of (x^(x^x))^(x^x) at x=1. %C A215708 Also n-th derivative of x^((x^x)^2) at x=1. %C A215708 First term < 0: a(175). %H A215708 Alois P. Heinz, <a href="/A215708/b215708.txt">Table of n, a(n) for n = 0..400</a> %F A215708 E.g.f.: (x+1)^((x+1)^(2*x+2)). %p A215708 a:= n-> n!*coeff(series(subs(x=x+1, x^((x^x)^2) ), x, n+1), x, n): %p A215708 seq(a(n), n=0..25); %Y A215708 Column k=11 of A215703. %Y A215708 Cf. A005727, A179230, A179405, A215524. %K A215708 sign %O A215708 0,3 %A A215708 _Alois P. Heinz_, Aug 21 2012