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Search: id:A034724
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| A034724 |
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One quarter of sextic factorial numbers. |
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+0
10
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| 1, 10, 160, 3520, 98560, 3351040, 134041600, 6165913600, 320627507200, 18596395417600, 1190169306726400, 83311851470848000, 6331700711784448000, 519199458366324736000, 45689552336236576768000
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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4*a(n) = (6*n-2)(!^6) := product(6*j-2, j=1..n) = 2^(n+1)*A034000(n), 2*A034000(n)=(3*n-1)(!^3); E.g.f. (-1+(1-6*x)^(-2/3))/4.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 9, 5!, 6}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A034000, A008542, A034689.
Sequence in context: A106261 A112125 A090374 this_sequence A074703 A064747 A054688
Adjacent sequences: A034721 A034722 A034723 this_sequence A034725 A034726 A034727
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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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