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A095987
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GCD(n!!,(n-1)!!) where n!! = A006882.
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0
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1, 1, 1, 1, 1, 3, 3, 3, 3, 15, 15, 45, 45, 315, 315, 315, 315, 2835, 2835, 14175, 14175, 155925, 155925, 467775, 467775, 6081075, 6081075, 42567525, 42567525, 638512875, 638512875, 638512875, 638512875, 10854718875, 10854718875
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Let f_n(m) be a multifactorial: for m = positive integer, f_n(m) = product{k=0 to floor((m-1)/n)} (m - k*n). E.g. f_2(m) = m!!. f_n(0) is defined as 1.
a(2m) = a(2m+1) = the largest odd divisor of m! (which is A049606).
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MATHEMATICA
| f[n_] := GCD[n!!, (n - 1)!! ]; Table[ f[n], {n, 35}]
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CROSSREFS
| a(2n) gives A049606.
Sequence in context: A029630 A170858 A024725 * A098535 A069239 A010265
Adjacent sequences: A095984 A095985 A095986 * A095988 A095989 A095990
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Jul 18 2004
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EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 19 2004
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