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A053532 E.g.f.: 1/(1-x)^(1/2)*exp(-1/2*x-1/4*x^2-1/6*x^3). 2
1, 0, 0, 0, 3, 12, 60, 360, 2835, 24696, 237384, 2503440, 28941165, 363593340, 4930388892, 71759200968, 1115892704745, 18465120087120, 323965034820720, 6007037150742624, 117377605956803571, 2410702829834021820, 51917379915449131020 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

REFERENCES

R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.15(a), k=4.

LINKS

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

FORMULA

a(n) ~ sqrt(2) * n^n / exp(n+11/12). - Vaclav Kotesovec, Aug 04 2014

CROSSREFS

Cf. A001205, A053533.

Sequence in context: A001710 A105752 A177138 * A159867 A082278 A078162

Adjacent sequences:  A053529 A053530 A053531 * A053533 A053534 A053535

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 16 2000

STATUS

approved

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Last modified October 17 22:48 EDT 2018. Contains 316297 sequences. (Running on oeis4.)