OFFSET
0,3
COMMENTS
First term < 0: a(329). - Alois P. Heinz, Sep 22 2015
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..400
FORMULA
E.g.f.: (x+1)^((x+1)^((x+1)^(x+1))). - Alois P. Heinz, Aug 23 2012
MAPLE
a:= n-> n!*coeff(series(subs(x=x+1, x^(x^(x^x)) ), x, n+1), x, n):
seq(a(n), n=0..30); # Alois P. Heinz, Aug 20 2012
MATHEMATICA
f[n_] := D[ x^(x^(x^x)), {x, n}] /. x -> 1; Array[f, 18, 0]
Range[0, 21]! CoefficientList[ Series[(1 + x)^(1 + x)^(1 + x)^(1 + x), {x, 0, 21}], x] (* Robert G. Wilson v, Feb 03 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Robert G. Wilson v, Jul 13 2010
EXTENSIONS
a(18)-a(21) from Alois P. Heinz, Aug 20 2012
STATUS
approved