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A305190
a(n) is the number of different numbers of Hamiltonian cycles (up to direction) in graphs with n vertices.
3
1, 1, 2, 3, 6, 16, 49, 232, 1351, 10367
OFFSET
1,3
LINKS
Erich Friedman, Math Magic (September 2012)
EXAMPLE
A graph on 4 vertices can have either 0, 1 or 3 Hamiltonian cycles (up to direction), which are 3 numbers, so a(4)= 3.
CROSSREFS
Cf. A244511.
Sequence in context: A284417 A219024 A145860 * A087983 A340911 A328409
KEYWORD
nonn,more
AUTHOR
Johan de Ruiter, May 27 2018
STATUS
approved