A307920 Number of (undirected) Hamiltonian cycles in the n X n black bishop graph.

0, 0, 4, 704, 553008, 13802629632, 1782158930138112, 14231924675064000331776

Offset: 2

Author

Eric W. Weisstein, May 06 2019

Keywords

• nonn
• hard
• more

Links

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

Crossrefs

Cf. A282889, A307929.

Formula

a(n) = A282889(n)/2.

Extensions

Offset corrected and a(2) prepended by Pontus von Brömssen, Nov 22 2020