A308142 Number of (undirected) Hamiltonian paths in the n-triangular graph.

0, 3, 120, 47760, 256193280, 23408523371520, 43819714229729034240

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Eric Weisstein's World of Mathematics, Hamiltonian Path

Eric Weisstein's World of Mathematics, Triangular Graph

Formula

a(n) = A137892(n)/2.

Crossrefs

Cf. A137892.

Sequence in context: A134230 A321109 A307936 * A289704 A246292 A202768

Adjacent sequences: A308139 A308140 A308141 * A308143 A308144 A308145

Keyword

nonn,hard,more

Author

Eric W. Weisstein, May 14 2019

Status

approved