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A155265 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,1 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 73, 333, 3889, 39159, 271617, 3012146, 61623325, 1541710905, 35611299121, 1059291769629, 47181801621713, 2749984961944969 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............0.1

............1.1.1

...........0.0.1.0

..........0.0.0.1.0

.........0.1.0.0.0.1

........1.1.1.0.1.1.0

.......0.0.1.0.1.1.0.0

......0.1.0.1.0.0.1.0.0

.....1.1.0.0.0.1.0.0.0.1

....1.1.0.1.1.1.0.1.1.1.0

...0.0.1.0.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A155284 A155304 A183454 * A155253 A155234 A222964

Adjacent sequences:  A155262 A155263 A155264 * A155266 A155267 A155268

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 28 07:30 EDT 2022. Contains 354112 sequences. (Running on oeis4.)