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A155352 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,2 3,0 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 275, 2315, 14549, 65253, 367867, 3643355, 50258373, 656861493, 8054133067, 125882858619, 2726987375461, 73216488029301, 2108368359421323, 66596647574072923 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..22.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.1

.........0.0.1

........1.0.1.0

.......0.1.1.0.0

......0.0.0.0.1.1

.....1.0.1.0.1.0.1

....1.0.0.1.0.0.0.1

...0.1.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A155340 A155409 A155406 * A155361 A155315 A155323

Adjacent sequences:  A155349 A155350 A155351 * A155353 A155354 A155355

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)