A306496 Number of (undirected) Hamiltonian cycles in the n-crown graph.

0, 0, 1, 6, 156, 4800, 208440, 11939760, 874681920, 79795860480, 8873760470400, 1181869427692800, 185755937440550400, 34022680848982425600, 7183771725162237004800, 1732270657442505852672000, 473131604733608510097408000, 145308345869661566419795968000

Offset: 1

Author

Eric W. Weisstein, May 06 2019

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Crown Graph
• Eric Weisstein's World of Mathematics, Hamiltonian Cycle

Crossrefs

Cf. A094047.

Formula

a(n) = A094047(n)/2.