A234624 Number of (undirected) cycles in the n X n rook graph.

0, 1, 312, 3228524, 6198979538330, 3366323909717796339009

Offset

1,3

Links

Table of n, a(n) for n=1..6.

Eric Weisstein's World of Mathematics, Graph Cycle

Eric Weisstein's World of Mathematics, Rook Graph

Crossrefs

Main diagonal of A286418.

Cf. A269561, A096970.

Sequence in context: A282792 A008694 A370309 * A292197 A083972 A045275

Adjacent sequences: A234621 A234622 A234623 * A234625 A234626 A234627

Keyword

nonn,more

Author

Eric W. Weisstein, Dec 28 2013

Extensions

a(6) from Andrew Howroyd, May 08 2017

Status

approved