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 A215706 #16 Sep 23 2015 09:44:37 %S A215706 1,1,8,48,344,3160,31776,349440,4270304,56343456,794577600, %T A215706 11975388480,191431339392,3225851451264,57152333898240, %U A215706 1061030230525440,20569247105571840,415385999498849280,8719401647417757696,189836589049809334272,4278839631584572661760 %N A215706 n-th derivative of (((x^x)^x)^x)^x at x=1. %C A215706 Also n-th derivative of x^(x^4) at x=1. %C A215706 First term < 0: a(130). %H A215706 Alois P. Heinz, <a href="/A215706/b215706.txt">Table of n, a(n) for n = 0..400</a> %F A215706 E.g.f.: (x+1)^((x+1)^4). %p A215706 a:= n-> n!*coeff(series(subs(x=x+1, (((x^x)^x)^x)^x ), x, n+1), x, n): %p A215706 seq(a(n), n=0..25); %Y A215706 Column k=9 of A215703. %Y A215706 Cf. A005727, A179230, A179405, A215524. %K A215706 sign %O A215706 0,3 %A A215706 _Alois P. Heinz_, Aug 21 2012