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Search: id:A034908
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| A034908 |
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One half of octo-factorial numbers. |
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+0
10
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| 1, 10, 180, 4680, 159120, 6683040, 334152000, 19380816000, 1279133856000, 94655905344000, 7761784238208000, 698560581438720000, 68458936980994560000, 7256647319985423360000, 827257794478338263040000
(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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2*a(n) = (8*n-6)(!^8) := product(8*j-6, j=1..n) = 2^n*A007696(n), A007696(n)=(4*n-3)(!^4) := product(4*j-3, j=1..n); E.g.f. (-1+(1-8*x)^(-1/4))/2.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 9, 5!, 8}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A045755, A034909-A039412.
Sequence in context: A067416 A113671 A001762 this_sequence A030048 A054918 A095807
Adjacent sequences: A034905 A034906 A034907 this_sequence A034909 A034910 A034911
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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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