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A155342 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,1 4,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 361, 2515, 15385, 83649, 564736, 5375347, 66177036, 879906596, 12668769870, 218134701822, 4684620580146 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 1,1 2,0 2,1 3,1 3,2 4,1 4,2 5,3 polyhexes.

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

............0

...........0.0

..........0.1.0

.........1.0.1.1

........0.1.1.0.0

.......0.1.0.0.1.0

......1.0.0.0.0.1.1

.....0.1.1.0.0.1.0.0

....0.1.0.1.1.0.1.1.0

...0.0.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155327 A155363 A155395 * A155408 A155358 A155353

Adjacent sequences:  A155339 A155340 A155341 * A155343 A155344 A155345

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 21 19:25 EDT 2019. Contains 325199 sequences. (Running on oeis4.)