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Search: id:A034325
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| A034325 |
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One fifth of quintic factorial numbers. |
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+0
9
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| 1, 10, 150, 3000, 75000, 2250000, 78750000, 3150000000, 141750000000, 7087500000000, 389812500000000, 23388750000000000, 1520268750000000000, 106418812500000000000, 7981410937500000000000, 638512875000000000000000
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 594
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FORMULA
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5*a(n) = (5*n)(!^5) := product(5*j, j=1..n) = 5^(n-1)*n!; E.g.f. (-1+(1-5*x)^(-1))/5, a(0) := 0.
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 9, 5!, 5}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A008548, A034300, A034301, A034323, A052562.
Sequence in context: A157867 A116156 A025750 this_sequence A048907 A061654 A087603
Adjacent sequences: A034322 A034323 A034324 this_sequence A034326 A034327 A034328
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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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