A269561 Number of (undirected) Hamiltonian cycles in the n X n rook graph K_n X K_n.

1, 48, 284112, 335750676480, 112249362914249932800, 14994936423694913432308324761600

Offset

2,2

Links

Table of n, a(n) for n=2..7.

Eric Weisstein's World of Mathematics, Hamiltonian Cycle

Eric Weisstein's World of Mathematics, Rook Graph

Crossrefs

Cf. A269562, A096970, A003763, A222199.

Sequence in context: A282596 A272262 A146204 * A079234 A051235 A282403

Adjacent sequences: A269558 A269559 A269560 * A269562 A269563 A269564

Keyword

nonn,more

Author

Andrew Howroyd, Feb 29 2016

Extensions

Name adjusted by Eric W. Weisstein, May 06 2019

Status

approved