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A035013
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One third of 9-factorial numbers.
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12
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1, 12, 252, 7560, 294840, 14152320, 806682240, 53241027840, 3993077088000, 335418475392000, 31193918211456000, 3181779657568512000, 353177541990104832000, 42381305038812579840000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| E.g.f. is G.f. for A034171(n-1).
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LINKS
| Index entries for sequences related to factorial numbers
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FORMULA
| 3*a(n) = (9*n-6)(!^9) := product(9*j-6, j=1..n) = 3^n*A007559(n), A007559(n)=(3*n-2)(!^3); E.g.f. (-1+(1-9*x)^(-1/3))/3.
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MATHEMATICA
| s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 11, 2*5!, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
| Cf. A007559, A034171, A045756, A035012, A035013, A035017, A035018, A035020-A035023.
Sequence in context: A012066 A099139 A198475 * A065583 A129585 A034672
Adjacent sequences: A035010 A035011 A035012 * A035014 A035015 A035016
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KEYWORD
| easy,nonn
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AUTHOR
| Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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