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A306496
Number of (undirected) Hamiltonian cycles in the n-crown graph.
1
0, 0, 1, 6, 156, 4800, 208440, 11939760, 874681920, 79795860480, 8873760470400, 1181869427692800, 185755937440550400, 34022680848982425600, 7183771725162237004800, 1732270657442505852672000, 473131604733608510097408000, 145308345869661566419795968000
OFFSET
1,4
LINKS
Eric Weisstein's World of Mathematics, Crown Graph
Eric Weisstein's World of Mathematics, Hamiltonian Cycle
FORMULA
a(n) = A094047(n)/2.
CROSSREFS
Cf. A094047.
Sequence in context: A203023 A128120 A237529 * A282564 A324231 A283728
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, May 06 2019
STATUS
approved