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A234624 Number of (undirected) cycles in the n X n rook graph. 3
0, 1, 312, 3228524, 6198979538330, 3366323909717796339009 (list; graph; refs; listen; history; text; internal format)
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: A290181 A282792 A008694 * 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

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Last modified January 19 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)