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Search: id:A049308
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| A049308 |
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Sextuple factorial numbers: product[ k=0..n-1 ] (6*k+4). |
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+0
9
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| 1, 4, 40, 640, 14080, 394240, 13404160, 536166400, 24663654400, 1282510028800, 74385581670400, 4760677226905600, 333247405883392000, 25326802847137792000, 2076797833465298944000, 182758209344946307072000
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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E.g.f. (1-6*x)^(-2/3).
a(n) = 2^n*A008544(n).
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 3, 5!, 6}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A008544, A011781, A008543.
Sequence in context: A141010 A141011 A090359 this_sequence A005431 A153849 A010792
Adjacent sequences: A049305 A049306 A049307 this_sequence A049309 A049310 A049311
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KEYWORD
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nonn,easy
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AUTHOR
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Joe Keane (jgk(AT)jgk.org)
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