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A297059
Number of edge covers in the n X n rook graph.
0
0, 7, 156492, 221223005569649, 1151204909283644125337234622000
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Edge Cover
Eric Weisstein's World of Mathematics, Rook Graph
CROSSREFS
Sequence in context: A013842 A247791 A243859 * A306256 A145322 A145335
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Dec 24 2017
EXTENSIONS
a(4)-a(5) from Andrew Howroyd, Dec 27 2017
STATUS
approved