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A034833
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One sixth of sept-factorial numbers.
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2
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1, 13, 260, 7020, 238680, 9785880, 469722240, 25834723200, 1601752838400, 110520945849600, 8399591884569600, 697166126419276800, 62744951377734912000, 6086260283640286464000, 632971069498589792256000
(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
| 6*a(n) = (7*n-1)(!^7) := product(7*j-1, j=1..n) =(7*n)!/(7^n*n!*A045754(n)*2*A034829(n)*3*A034830(n)*4*A034831(n)*5*A034832(n)); E.g.f. (-1+(1-7*x)^(-6/7))/6.
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MATHEMATICA
| s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 12, 5!, 7}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
| Cf. A045754, A034829-A034834.
Sequence in context: A157946 A034242 A142811 * A101004 A142931 A142262
Adjacent sequences: A034830 A034831 A034832 * A034834 A034835 A034836
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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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