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A307928
Number of (undirected) Hamiltonian cycles in the n X n queen graph.
0
3, 1960, 402364270, 39741746126749664
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Hamiltonian Cycle
Eric Weisstein's World of Mathematics, Queen Graph
FORMULA
a(n) = A158663(n)/2. - Andrew Howroyd, Sep 08 2019
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Eric W. Weisstein, May 06 2019
STATUS
approved