OFFSET
0,3
FORMULA
a(n) ~ phi^(5*n/2) * n^n / (5^(1/4) * exp(n)), where phi = A001622 = (1+sqrt(5))/2 is the golden ratio. - Vaclav Kotesovec, Oct 02 2017
MATHEMATICA
Table[n! SeriesCoefficient[Exp[n ArcTanh[x]], {x, 0, n}], {n, 0, 19}]
Table[n! SeriesCoefficient[Exp[n Sum[x^(2 k + 1)/(2 k + 1), {k, 0, Infinity}]], {x, 0, n}], {n, 0, 19}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Oct 02 2017
STATUS
approved