OFFSET
0,3
COMMENTS
A digraph is Hamiltonian if it contains a directed cycle passing through every vertex exactly once.
LINKS
EXAMPLE
Non-isomorphic representatives of the a(2) = 7 digraph edge-sets:
{}
{11}
{12}
{11,12}
{11,21}
{11,22}
{11,12,22}
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gus Wiseman, Jun 15 2019
STATUS
approved