A274304 A bisection of A002866.

1, 4, 192, 23040, 5160960, 1857945600, 980995276800, 714164561510400, 685597979049984000, 839171926357180416000, 1275541328062914232320000, 2357200374260265501327360000, 5204698426366666226930810880000, 13532215908553332190020108288000000

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Crossrefs

Cf. A002671, A002866.

Sequence in context: A163839 A012015 A012102 * A299999 A007341 A203516

Adjacent sequences: A274301 A274302 A274303 * A274305 A274306 A274307

Keyword

nonn

Author

N. J. A. Sloane, Jun 20 2016

Status

approved