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A053533 E.g.f.: 1/(1-x)^(1/2)*exp(-1/2*x-1/4*x^2-1/6*x^3-1/8*x^4). 2
1, 0, 0, 0, 0, 12, 60, 360, 2520, 20160, 199584, 2147040, 25043040, 315485280, 4274281440, 62237343168, 968728662720, 16046598597120, 281802435747840, 5229395457937920, 102253297006250496, 2101387824575550720, 45281611027331723520 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

REFERENCES

R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.15(a), k=5.

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(n) ~ sqrt(2) * n^n / exp(n+25/24). - Vaclav Kotesovec, Aug 04 2014

CROSSREFS

Cf. A001205, A053532.

Sequence in context: A114307 A009031 A009136 * A219738 A127869 A012518

Adjacent sequences:  A053530 A053531 A053532 * A053534 A053535 A053536

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 16 2000

STATUS

approved

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Last modified October 19 07:21 EDT 2018. Contains 316337 sequences. (Running on oeis4.)