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A034724
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One quarter of sextic factorial numbers.
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9
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1, 10, 160, 3520, 98560, 3351040, 134041600, 6165913600, 320627507200, 18596395417600, 1190169306726400, 83311851470848000, 6331700711784448000, 519199458366324736000, 45689552336236576768000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| 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
| 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
| Cf. A034000, A008542, A034689.
Sequence in context: A106261 A112125 A090374 * A074703 A190903 A064747
Adjacent sequences: A034721 A034722 A034723 * A034725 A034726 A034727
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KEYWORD
| easy,nonn
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AUTHOR
| Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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