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Search: id:A034831
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| A034831 |
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One quarter of sept-factorial numbers. |
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+0
3
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| 1, 11, 198, 4950, 158400, 6177600, 284169600, 15060988800, 903659328000, 60545174976000, 4480342948224000, 362907778806144000, 31935884534940672000, 3033909030819363840000, 309458721143575111680000
(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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4*a(n) = (7*n-3)(!^7) := product(7*j-3, j=1..n); E.g.f. (-1+(1-7*x)^(-4/7))/4.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 10, 5!, 7}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A045754, A034829-A034834.
Sequence in context: A112127 A142996 A105124 this_sequence A142362 A140534 A112733
Adjacent sequences: A034828 A034829 A034830 this_sequence A034832 A034833 A034834
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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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