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Search: id:A147630
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| A147630 |
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9-factorial numbers (5). |
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+0
2
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| 1, 6, 90, 2160, 71280, 2993760, 152681760, 9160905600, 632102486400, 49303993939200, 4289447472710400, 411786957380198400, 43237630524920832000, 4929089879840974848000, 606278055220439906304000
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n+1)=Sum_{k, 0<=k<=n}A132393(n,k)*6^k*9^(n-k). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 09 2008]
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 5, 2*5!, 9}]; lst
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CROSSREFS
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Cf. A147629, A049211, A051232, A045756, A035012, A035013, A035017, A035018, A035020, A035022, A035023, A053116
Adjacent sequences: A147627 A147628 A147629 this_sequence A147631 A147632 A147633
Sequence in context: A002896 A004996 A001499 this_sequence A132467 A000680 A013297
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008
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