A134983 Number of ways of placing n rooks on an n X n chessboard with the topology of a Klein bottle.

1, 2, 4, 12, 40, 168, 784, 4272, 25504, 171168, 1242688, 9915072, 84714112, 783454848, 7697178880

Offset

1,2

Links

Table of n, a(n) for n=1..15.

R. W. Whitty, Rook polynomials on two-dimensional surfaces and graceful labellings of graphs, Discrete Math., 308 (2008), 674-683.

Crossrefs

Sequence in context: A188479 A062962 A033472 * A330679 A342225 A218144

Adjacent sequences: A134980 A134981 A134982 * A134984 A134985 A134986

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 08 2008

Status

approved