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Search: id:A035021
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| A035021 |
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One seventh of 9-factorial numbers. |
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+0
2
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| 1, 16, 400, 13600, 584800, 30409600, 1854985600, 129848992000, 10258070368000, 902710192384000, 87562888661248000, 9281666198092288000, 1067391612780613120000, 132356559984796026880000
(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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7*a(n) = (9*n-2)(!^9) := product(9*j-2, j=1..n); E.g.f. (-1+(1-9*x)^(-7/9))/7.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 15, 2*5!, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A007559, A034171, A045756, A035012, A035013, A035017, A035018, A035020-A035023.
Sequence in context: A114426 A051360 A071133 this_sequence A035275 A143039 A111921
Adjacent sequences: A035018 A035019 A035020 this_sequence A035022 A035023 A035024
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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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