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Search: id:A035022
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| A035022 |
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One eighth of 9-factorial numbers. |
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+0
6
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| 1, 17, 442, 15470, 680680, 36076040, 2236714480, 158806728080, 12704538246400, 1130703903929600, 110808982585100800, 11856561136605785600, 1375361091846271129600, 171920136480783891200000
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Index entries for sequences related to factorial numbers
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FORMULA
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8*a(n) = (9*n-1)(!^9) := product(9*j-1, j=1..n)= (9*n)!/(n!*2^4*3^(4*n)*5*7*A045756(n)*A035012(n)*A007559(n)*A035017(n)*A035018(n)*A034000(n)*A035021(n)); E.g.f. (-1+(1-9*x)^(-8/9))/8.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 16, 2*5!, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A007559, A034171, A045756, A035012, A035013, A035017, A035018, A035020-A035023.
Sequence in context: A053114 A167474 A158063 this_sequence A023150 A012117 A122430
Adjacent sequences: A035019 A035020 A035021 this_sequence A035023 A035024 A035025
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KEYWORD
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easy,nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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