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A049308
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Sextuple factorial numbers: product[ k=0..n-1 ] (6*k+4).
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8
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1, 4, 40, 640, 14080, 394240, 13404160, 536166400, 24663654400, 1282510028800, 74385581670400, 4760677226905600, 333247405883392000, 25326802847137792000, 2076797833465298944000, 182758209344946307072000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| E.g.f. (1-6*x)^(-2/3).
a(n) = 2^n*A008544(n).
G.f.: 1/(1-4x/(1-6x/(1-10x/(1-12x/(1-16x/(1-18x/(1-22x/(1-24x/(1-28x/(1-... (continued fraction). - DELEHAM Philippe, Jan 08 2012
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MATHEMATICA
| 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
| Cf. A008544, A011781, A008543.
Sequence in context: A141010 A141011 A090359 * A205671 A181088 A005431
Adjacent sequences: A049305 A049306 A049307 * A049309 A049310 A049311
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KEYWORD
| nonn,easy
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AUTHOR
| Joe Keane (jgk(AT)jgk.org)
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