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A155222 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 184, 1433, 15532, 213600, 3754855, 93144364, 3159998575, 143228568126, 8737142545792, 720729233703571 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..15.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............1.1

............0.0.1

...........1.0.0.1

..........1.0.0.0.0

.........0.1.0.0.1.1

........1.0.1.0.1.0.0

.......0.1.0.0.1.0.1.0

......0.0.1.1.0.0.1.0.1

.....1.1.0.0.0.1.1.0.0.1

....1.0.0.0.1.0.0.0.1.0.1

...1.0.1.1.1.0.1.1.1.0.1.0

CROSSREFS

Sequence in context: A147615 A173872 A155241 * A155283 A155282 A193646

Adjacent sequences:  A155219 A155220 A155221 * A155223 A155224 A155225

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 19 21:57 EST 2014. Contains 252240 sequences.