login
A155287
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 10, 22, 40, 147, 972, 6099, 33889, 206340, 1814635, 22696011, 314005946, 4605664055, 78764798797, 1720340418305, 47411742873448
OFFSET
3,2
COMMENTS
Same series for 0,0 1,0 2,0 2,1 3,1 3,2 3,3 polyhexes.
EXAMPLE
Maximal 12 X 12 X 12 example
..............1
.............0.1
............0.0.1
...........1.1.1.0
..........0.0.0.0.1
.........1.1.0.0.1.0
........1.0.1.0.1.0.0
.......1.0.0.1.0.1.1.1
......0.0.0.0.0.0.0.0.0
.....1.1.0.1.0.0.1.0.1.1
....1.0.1.0.1.0.1.0.1.0.1
...1.0.0.1.0.1.1.0.1.0.0.1
CROSSREFS
Sequence in context: A155404 A155360 A155382 * A155337 A155402 A155232
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved