A307930 Number of (undirected) Hamiltonian circuits in the n-triangular graph.

0, 0, 1, 16, 3216, 9748992, 554701578240, 690468767270830080

Offset: 2

Author

Eric W. Weisstein, May 06 2019

Keywords

• nonn
• more
• hard

Links

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

Crossrefs

Cf. A129349.

Formula

a(n) = A129349(n)/2.