OFFSET
1,3
LINKS
Giovanni Resta, Simple C program for computing a(1)-a(4)
Ed Wynn, Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs, arXiv:1402.0545 [math.CO], 2014.
FORMULA
EXAMPLE
When n = 2, there is only 1 Hamiltonian circuit in a 4 X 4 square lattice where the orbits under the symmetry group of the square have 2 elements. The 2 elements are:
o__o__o__o o__o o__o
| | | | | |
o__o o__o o o__o o
| | | |
o__o o__o o o__o o
| | | | | |
o__o__o__o o__o o__o
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Christopher Hunt Gribble, Jul 05 2013
EXTENSIONS
a(4) from Giovanni Resta, Jul 11 2013
a(5)-a(10) from Ed Wynn, Feb 05 2014
STATUS
approved