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A129349 Number of (directed) Hamiltonian circuits in the triangular graph of order n. 1
0, 0, 2, 32, 6432, 19497984, 1109403156480, 1380937534541660160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..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 A091804 A012853

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

STATUS

approved

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Last modified January 16 03:17 EST 2019. Contains 319184 sequences. (Running on oeis4.)