A155243 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 102, 1264, 9091, 48176, 418130, 8182255, 143523182, 2278072430, 53254810257, 2027413206531, 84728501324609, 3776435859240528, 226344677177142828, 18987749209358606115, 1902812184280545994272

Offset

3,2

Comments

Same series for 1,0 1,1 2,1 2,2 3,1 3,2 polyhexes.

Links

Table of n, a(n) for n=3..21.

Example

Maximal 10 X 10 X 10 example
............0
...........1.1
..........1.0.1
.........0.0.1.0
........1.1.0.0.1
.......1.0.0.1.0.1
......0.1.1.0.1.1.0
.....1.0.0.0.0.0.0.1
....1.0.1.0.0.0.1.0.1
...0.1.1.0.0.0.0.1.1.0

Crossrefs

Sequence in context: A155437 A155299 A155379 * A155417 A155416 A155391

Adjacent sequences: A155240 A155241 A155242 * A155244 A155245 A155246

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved