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 A215707 #12 Sep 22 2015 10:09:51 %S A215707 1,1,6,33,228,1880,17742,187124,2176360,27617616,378764280,5574170712, %T A215707 87491513304,1457433784560,25654258467432,475431102931080, %U A215707 9246150139382400,188172595998890688,3997389233216787264,88440294467474068608,2033755519425292281600 %N A215707 n-th derivative of ((x^x)^x)^(x^x) at x=1. %C A215707 Also n-th derivative of ((x^(x^x))^x)^x, ((x^x)^(x^x))^x, x^(x^x*x^2) at x=1. %C A215707 First term < 0: a(152). %H A215707 Alois P. Heinz, <a href="/A215707/b215707.txt">Table of n, a(n) for n = 0..400</a> %F A215707 E.g.f.: (x+1)^((x+1)^(x+3)). %p A215707 a:= n-> n!*coeff(series(subs(x=x+1, x^(x^x*x^2) ), x, n+1), x, n): %p A215707 seq(a(n), n=0..25); %Y A215707 Column k=10 of A215703. %Y A215707 Cf. A005727, A179230, A179405, A215524. %K A215707 sign %O A215707 0,3 %A A215707 _Alois P. Heinz_, Aug 21 2012