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A052699
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E.g.f. (1+x^5-x^6)/(1-x).
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0
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1, 1, 2, 6, 24, 240, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600, 6227020800, 87178291200, 1307674368000, 20922789888000, 355687428096000, 6402373705728000, 121645100408832000, 2432902008176640000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 649
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FORMULA
| E.g.f.: (-1-x^5+x^6)/(-1+x)
Recurrence: {a(1)=1, a(0)=1, (-1-n)*a(n)+a(n+1)=0, a(3)=6, a(2)=2, a(4)=24, a(6)=720, a(5)=240}
n!, n>5.
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MAPLE
| spec := [S, {S=Union(Sequence(Z), Prod(Z, Z, Z, Z, Z))}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A012711 A073973 A034874 * A074351 A052597 A052632
Adjacent sequences: A052696 A052697 A052698 * A052700 A052701 A052702
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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