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Search: id:A051581
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| A051581 |
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(2*n+7)!!/7!!, related to A001147 (odd double factorials). |
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+0
2
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| 1, 9, 99, 1287, 19305, 328185, 6235515, 130945815, 3011753745, 75293843625, 2032933777875, 58955079558375, 1827607466309625, 60311046388217625, 2110886623587616875, 78102805072741824375, 3046009397836931150625
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row m=7 of the array A(3; m,n) := (2*n+m)!!/m!!, m >= 0, n >= 0.
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FORMULA
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a(n) = (2*n+7)!!/7!!; e.g.f.: 1/(1-2*x)^(9/2).
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MAPLE
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with(finance):seq(mul(cashflows([k, k, 1], 0), k=4..n), n=3..22); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 22 2008]
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CROSSREFS
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Cf. A000165, A001147(n+1), A002866(n+1), A051577-A051580 (rows m=0..6).
Sequence in context: A103456 A155157 A015685 this_sequence A080291 A113395 A070068
Adjacent sequences: A051578 A051579 A051580 this_sequence A051582 A051583 A051584
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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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