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A134983 Number of ways of placing n rooks on an n X n chessboard with the topology of a Klein bottle. 0
1, 2, 4, 12, 40, 168, 784, 4272, 25504, 171168, 1242688, 9915072, 84714112, 783454848, 7697178880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

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

LINKS

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

CROSSREFS

Sequence in context: A188479 A062962 A033472 * A218144 A222919 A264760

Adjacent sequences:  A134980 A134981 A134982 * A134984 A134985 A134986

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 08 2008

STATUS

approved

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)