A129349 Number of directed Hamiltonian circuits in the n-triangular graph.

0, 2, 32, 6432, 19497984, 1109403156480, 1380937534541660160

Offset

2,2

Links

Table of n, a(n) for n=2..8.

Eric Weisstein's World of Mathematics, Hamiltonian Cycle

Eric Weisstein's World of Mathematics, Triangular Graph

Crossrefs

Sequence in context: A012599 A247859 A202629 * A180127 A342099 A091804

Adjacent sequences: A129346 A129347 A129348 * A129350 A129351 A129352

Keyword

nonn,more

Author

Eric W. Weisstein, Apr 10 2007

Extensions

a(6) from Alois P. Heinz, Nov 29 2010

a(7)-a(8) from Eric W. Weisstein, Mar 31 2014

Missing factor of 2 applied to a(8) by Eric W. Weisstein, Apr 08 2014

Offset corrected by Eric W. Weisstein, May 06 2019

Status

approved