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A055504 n*(n-1)*(n-2)*(n-3)*(n-4)*(2*n-1)/72. 1
0, 0, 0, 0, 0, 15, 110, 455, 1400, 3570, 7980, 16170, 30360, 53625, 90090, 145145, 225680, 340340, 499800, 717060, 1007760, 1390515, 1887270, 2523675, 3329480, 4338950, 5591300, 7131150, 9009000, 11281725, 14013090, 17274285, 21144480 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

REFERENCES

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 73, Problem 3.

LINKS

Table of n, a(n) for n=0..32.

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

G.f.: 5*x^5*(3+x)/(1-x)^7. [Colin Barker, May 09 2012]

CROSSREFS

Sequence in context: A232117 A232197 A205352 * A060931 A107585 A205347

Adjacent sequences:  A055501 A055502 A055503 * A055505 A055506 A055507

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 10 2000

STATUS

approved

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Last modified October 17 08:38 EDT 2018. Contains 316276 sequences. (Running on oeis4.)