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A131121 a(n) = A131120(n+1)/n. 2
1, 1, 1, 1, 2, 2, 12, 12, 12, 12, 120, 120, 1440, 1440, 10080, 30240, 60480, 60480, 120960, 120960, 2419200, 7257600, 79833600, 79833600, 479001600, 479001600, 12454041600, 12454041600, 174356582400, 174356582400, 5230697472000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..31.

MAPLE

A131120 := proc(n) option remember ; if n = 1 then 1; else (n-1)!/lcm(seq(A131120(i), i=1..n-1)) ; fi ; end: A131121 := proc(n) A131120(n+1)/n ; end: seq(A131121(n), n=1..40) ; # R. J. Mathar, Oct 17 2007

CROSSREFS

Cf. A131120.

Sequence in context: A275279 A109767 A196061 * A232853 A055772 A025527

Adjacent sequences:  A131118 A131119 A131120 * A131122 A131123 A131124

KEYWORD

nonn

AUTHOR

Leroy Quet, Jun 15 2007

EXTENSIONS

More terms from R. J. Mathar, Oct 17 2007

STATUS

approved

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Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)