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 A163088 (Product{k|n} k\$) / n\$. Here '\$' denotes the swinging factorial function (A056040). 2
 1, 1, 1, 1, 2, 1, 12, 1, 12, 6, 60, 1, 240, 1, 280, 180, 840, 1, 151200, 1, 90720, 840, 5544, 1, 15523200, 30, 24024, 3780, 5765760, 1, 93405312000, 1, 10810800, 16632, 437580, 4200, 6792641856000, 1, 1847560, 72072, 1173274502400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Peter Luschny, Swinging Primes. MAPLE a := n -> A163087(n) / A056040(n): MATHEMATICA sf[n_] := With[{f = Floor[n/2]}, Pochhammer[f+1, n-f]/f!]; a[0] = 1; a[n_] := Product[sf[k], {k, Divisors[n]}]/sf[n]; Table[a[n], {n, 0, 40}] (* Jean-François Alcover, Jul 26 2013 *) CROSSREFS Cf. A163087, A163089. Sequence in context: A069249 A128247 A161150 * A105608 A051190 A072512 Adjacent sequences:  A163085 A163086 A163087 * A163089 A163090 A163091 KEYWORD nonn AUTHOR Peter Luschny, Jul 21 2009 STATUS approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)