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Search: id:A034829
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| A034829 |
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One half of sept-factorial numbers. |
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+0
10
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| 1, 9, 144, 3312, 99360, 3676320, 161758080, 8249662080, 478480400640, 31101226041600, 2239288274995200, 176903773724620800, 15213724540317388800, 1414876382249517158400, 141487638224951715840000
(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) = (7*n-5)(!^7) := product(7*j-5, j=1..n); E.g.f. (-1+(1-7*x)^(-2/7))/2.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 8, 5!, 7}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A045754, A034830, A034831, A034832, A034833, A034834.
Sequence in context: A134176 A067415 A069134 this_sequence A162993 A094594 A046529
Adjacent sequences: A034826 A034827 A034828 this_sequence A034830 A034831 A034832
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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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