A076001 (1/2)*A075998.

1, 3, 4, 30, 24, 168, 288, 1080, 1920, 12672, 8640, 131040, 161280, 414720, 774144, 10575360, 8294400, 36771840, 69672960, 383201280, 729907200, 4578508800, 2043740160, 45287424000, 65213890560, 180592312320, 347807416320

Offset

1,2

Links

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

Example

a(6) = (1/2)*<6/1>*<6/2>*<6/3>*<6/4>*<6/5>*<6/6> = (1/2)*7*4*3*1*2*2 = 168, where <x> denotes the integer second-nearest to x, as defined at A075998.

Crossrefs

Cf. A075998 (product of second-nearest integers), A010786 (product of [n/k], k=1, 2, ..., n).

Sequence in context: A100600 A345022 A288868 * A225629 A032833 A151466

Adjacent sequences: A075998 A075999 A076000 * A076002 A076003 A076004

Keyword

nonn

Author

Clark Kimberling, Sep 29 2002

Status

approved