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Search: id:A034830
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| A034830 |
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One third of sept-factorial numbers. |
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+0
4
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| 1, 10, 170, 4080, 126480, 4806240, 216280800, 11246601600, 663549494400, 43794266630400, 3196981464019200, 255758517121536000, 22250990989573632000, 2091593153019921408000, 211250908455012062208000
(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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3*a(n) = (7*n-4)(!^7) := product(7*j-4, j=1..n); E.g.f. (-1+(1-7*x)^(-3/7))/3.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 9, 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: A006297 A099711 A120977 this_sequence A098345 A119043 A133273
Adjacent sequences: A034827 A034828 A034829 this_sequence A034831 A034832 A034833
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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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