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A155293
Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 55, 192, 1118, 8943, 73694, 651536, 7389025, 113816897, 2201513666, 49743400975, 1349906323760
OFFSET
4,2
EXAMPLE
Maximal 12 X 12 X 12 example
..............1
.............1.0
............0.1.1
...........0.1.0.0
..........0.1.0.0.1
.........1.0.0.0.1.0
........0.1.1.1.0.1.1
.......1.1.0.0.0.1.0.0
......0.0.0.1.0.1.0.1.0
.....1.0.0.0.1.0.0.0.1.0
....0.1.1.1.0.1.1.0.0.1.1
...1.1.0.0.0.1.0.1.0.1.0.1
CROSSREFS
Sequence in context: A155244 A155310 A155288 * A155311 A155289 A155306
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved