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A155407
Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 10, 22, 49, 162, 562, 3016, 16877, 98214, 637805, 5164375, 49219867, 557800561, 7204177132, 106101558795
OFFSET
4,2
EXAMPLE
Maximal 9 X 9 X 9 example
...........1
..........0.1
.........1.1.0
........0.1.1.0
.......1.1.0.0.1
......0.0.0.0.1.0
.....0.1.0.0.0.1.1
....1.1.1.1.0.1.1.0
...1.0.1.0.1.0.0.1.1
CROSSREFS
Sequence in context: A178452 A324536 A137247 * A318416 A124697 A155426
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved