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A035012
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One half of 9-factorial numbers.
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14
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1, 11, 220, 6380, 242440, 11394680, 638102080, 41476635200, 3069271004800, 254749493398400, 23436953392652800, 2367132292657932800, 260384552192372608000, 30985761710892340352000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index entries for sequences related to factorial numbers
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FORMULA
| 2*a(n) = (9*n-7)(!^9) := product(9*j-7, j=1..n); E.g.f. (-1+(1-9*x)^(-2/9))/2.
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MATHEMATICA
| s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 10, 2*5!, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
| Cf. A007558, A034171, A045756, A035012, A035013, A035017, A035018, A035020-A035023.
Cf. A084949.
Sequence in context: A187650 A160074 A204236 * A179339 A055411 A064093
Adjacent sequences: A035009 A035010 A035011 * A035013 A035014 A035015
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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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