A155363 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 4,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 79, 331, 1971, 11437, 56649, 326778, 2556228, 26440896, 303972325, 3581795416, 47721457149, 785585027118

Offset

5,2

Links

Table of n, a(n) for n=5..20.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.0.0
.........1.1.1.0
........1.0.0.0.1
.......1.1.0.1.1.1
......0.0.1.0.0.0.1
.....0.1.0.0.1.0.1.1
....0.0.1.0.1.0.1.0.0
...0.0.1.1.1.1.0.0.0.0

Crossrefs

Sequence in context: A155436 A155440 A155327 * A155395 A155342 A155408

Adjacent sequences: A155360 A155361 A155362 * A155364 A155365 A155366

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved