A131978 A049614(n)/A131685(n).

1, 1, 1, 4, 4, 24, 24, 192, 1728, 17280, 17280, 207360, 207360, 414720, 6220800, 99532800, 696729600, 12541132800, 12541132800, 250822656000, 5267275776000, 10534551552000, 10534551552000, 252829237248000, 1264146186240000, 12641461862400000, 3754514173132800000

Offset

1,4

Comments

Conjectured to be always integral.

It appears that every term > 4 is divisible by 3 - Alexander R. Povolotsky, Oct 18 2007

Links

Table of n, a(n) for n=1..27.

Crossrefs

Sequence in context: A271132 A270456 A088304 * A049614 A269186 A058166

Adjacent sequences: A131975 A131976 A131977 * A131979 A131980 A131981

Keyword

nonn

Author

Alexander R. Povolotsky, Sep 21 2007

Status

approved