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A037963 (n+5)!*n^2*(n+1)*(3*n^2+7*n-2)/11520. 1
0, 1, 126, 5796, 186480, 5103000, 129230640, 3162075840, 76592355840, 1863435974400, 45950224320000, 1155068769254400, 29708792431718400, 783699448602470400, 21234672840116736000, 591499300737945600000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

For n>=1, a(n) is equal to the number of surjections from {1,2,...,n+5} onto {1,2,...,n}. - Aleksandar M. Janjic and Milan Janjic, Feb 24 2007

REFERENCES

The right-hand side of a binomial coefficient identity in H. W. Gould, Combinatorial Identities, Morgantown, 1972.

LINKS

Table of n, a(n) for n=0..15.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

CROSSREFS

Sequence in context: A292882 A140902 A270512 * A240929 A285172 A208618

Adjacent sequences:  A037960 A037961 A037962 * A037964 A037965 A037966

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 27 13:04 EDT 2022. Contains 354097 sequences. (Running on oeis4.)