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A155358 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 3,2 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 439, 3622, 21277, 115970, 907157, 11150700, 162360713, 2286713291, 36892603949, 784002340205, 21639656177753 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.1

.........1.1.1

........1.1.1.0

.......0.1.0.0.0

......0.0.0.0.1.1

.....1.1.0.0.0.1.1

....1.1.1.1.0.1.1.0

...0.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A155395 A155342 A155408 * A155353 A155317 A237052

Adjacent sequences:  A155355 A155356 A155357 * A155359 A155360 A155361

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 24 14:53 EDT 2019. Contains 326294 sequences. (Running on oeis4.)