OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..386
FORMULA
a(n) ~ 4 * exp(-1) * n^(n-1) if n is even and a(n) ~ 2 * n^n if n is odd. - Vaclav Kotesovec, Jun 25 2018
PROG
(PARI) N=66; x='x+O('x^N); Vec((sum(k=0, N, (k*x)^k))/(sum(k=0, N, (-k*x)^k)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 24 2018
STATUS
approved