A131121 a(n) = A131120(n+1)/n.

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

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: A339297 A196061 A342582 * A232853 A328520 A055772

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