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Search: id:A113551
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| A113551 |
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a(n) = product of next n even numbers beginning with n if n is even else product of next n odd numbers beginning with n. |
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+0
2
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| 1, 8, 105, 1920, 45045, 1290240, 43648605, 1703116800, 75293843625, 3719607091200, 203067496256625, 12140797545676800, 788917222956988125, 55362036808286208000, 4172583192219510193125, 336158287499913854976000
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(3) = 3*5*7 = 105, a(4)= 4*6*8*10=1920.
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MAPLE
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seq(mul((2*k+n), k=1..n)/3, n=1..16); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 29 2008
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MATHEMATICA
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Do[Print[Product[n + 2i, {i, 0, n - 1}]], {n, 1, 20}] (Poff)
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CROSSREFS
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Cf. A113549, A113550.
Adjacent sequences: A113548 A113549 A113550 this_sequence A113552 A113553 A113554
Sequence in context: A034300 A119934 A001922 this_sequence A082735 A024358 A055406
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 03 2005
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EXTENSIONS
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More terms from Tracy Poff (tracy.poff(AT)gmail.com), Dec 31 2005
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