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A316090
a(n) = [x^n] (Sum_{k=0..n} (k*x)^k)/(Sum_{k=0..n} (-k*x)^k).
2
1, 2, 2, 48, 94, 5694, 12352, 1539850, 3323890, 737028224, 1556371198, 548747031342, 1138137849328, 586694732526026, 1202647898994626, 852409708509446800, 1734703213512100766, 1616070775292699964094, 3273912763003648926368, 3875483980992048140938410
OFFSET
0,2
LINKS
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