A215704 - OEIS

A215704

n-th derivative of ((x^x)^x)^x at x=1.

1, 1, 6, 27, 156, 1110, 8322, 70098, 646272, 6333336, 66712680, 745731360, 8780828328, 108873486072, 1413807287760, 19157627737080, 270460073295360, 3965693824244160, 60266513065134528, 947644484349584448, 15389579447794454400, 257702782790624613120

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OFFSET

0,3

COMMENTS

Also n-th derivative of x^(x^3) at x=1.

First term < 0: a(57).

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..400

FORMULA

E.g.f.: (x+1)^((x+1)^3).

MAPLE

a:= n-> n!*coeff(series(subs(x=x+1, ((x^x)^x)^x ), x, n+1), x, n):

seq(a(n), n=0..25);

CROSSREFS

Column k=5 of A215703.

Cf. A005727, A179230, A179405, A215524.

Sequence in context: A174634 A373714 A018901 * A137968 A062512 A087297

Adjacent sequences: A215701 A215702 A215703 * A215705 A215706 A215707

KEYWORD

sign

AUTHOR

Alois P. Heinz, Aug 21 2012

STATUS

approved