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Search: id:A001730
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| A001730 |
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n!/6!.
(Formerly M4436 N1876)
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+0
14
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| 1, 7, 56, 504, 5040, 55440, 665280, 8648640, 121080960, 1816214400, 29059430400, 494010316800, 8892185702400, 168951528345600, 3379030566912000
(list; graph; listen)
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OFFSET
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6,2
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REFERENCES
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Mitrinovic, D. S.; Mitrinovic, R. S.; Tableaux d'une classe de nombres relies aux nombres de Stirling. II. Univ. Beograd. Publ. Elektrotehn. Fak. Ser. Mat. Fiz. No. 107-108 1963 1-77.
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 266
Index entries for sequences related to factorial numbers
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FORMULA
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E.g.f. if offset 0: 1/(1-x)^7.
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MAPLE
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a:=n->mul(denom( (k+1)/(k+2) ), k=5..n): seq(a(n), n=4..18); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2008
a:=n->mul(numer( (k+1)/(k+2) ), k=6..n): seq(a(n), n=5..19); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2008
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CROSSREFS
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Cf. A051338, A051379. a(n)= A051339(n-6, 0)*(-1)^n (first unsigned column of triangle).
Adjacent sequences: A001727 A001728 A001729 this_sequence A001731 A001732 A001733
Sequence in context: A126694 A024091 A082305 this_sequence A087751 A099345 A110830
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KEYWORD
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nonn
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AUTHOR
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njas
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