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A052800
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A simple grammar.
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0
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0, 0, 0, 0, 0, 0, 720, 2520, 6720, 15120, 30240, 55440, 95040, 154440, 240240, 360360, 524160, 742560, 1028160, 1395360, 1860480
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,7
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 758
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FORMULA
| E.g.f.: x^5*exp(x)-x^5
Recurrence: {a(1)=0, a(2)=0, a(4)=0, a(3)=0, a(5)=0, a(6)=720, (-1-n)*a(n)+(-4+n)*a(n+1)}
0
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MAPLE
| spec := [S, {B=Set(Z, 1 <= card), S=Prod(Z, Z, Z, Z, Z, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A090392 A000805 A112530 * A052794 A096933 A061299
Adjacent sequences: A052797 A052798 A052799 * A052801 A052802 A052803
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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