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A155217
Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 2, 5, 10, 39, 205, 1026, 7765, 81639, 968094, 15354634, 328541791, 8661897260, 294910384475, 13193215967675, 751461392973699, 54989669970520419, 5219343962387133501, 636712452891464320519, 99887383227114543133737
OFFSET
1,2
EXAMPLE
Maximal 13 X 13 X 13 example
...............1
..............1.1
.............0.0.0
............1.0.1.1
...........1.1.0.1.0
..........0.0.0.0.0.1
.........1.0.1.1.0.1.1
........1.1.0.1.0.0.0.0
.......0.0.0.0.0.1.1.0.1
......1.1.0.1.1.0.1.0.1.1
.....0.1.0.0.1.0.0.0.0.0.0
....1.0.0.1.0.0.1.0.1.1.0.1
...1.1.0.1.1.0.1.1.0.1.0.1.1
CROSSREFS
Sequence in context: A018418 A363429 A290032 * A004143 A266162 A103036
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved