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A155347 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 178, 691, 3685, 20423, 128624, 1025960, 9573074, 102844369 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.0.0

...........1.1.0.0

..........0.0.1.1.0

.........0.0.0.0.1.1

........0.0.1.1.0.0.1

.......0.1.1.0.0.1.0.0

......1.1.0.0.1.1.0.0.1

.....1.0.0.1.1.0.0.1.1.0

....0.0.1.1.0.0.1.1.0.0.0

...0.0.0.0.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A203165 A100450 A155423 * A155385 A155345 A155309

Adjacent sequences:  A155344 A155345 A155346 * A155348 A155349 A155350

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 18 11:36 EDT 2019. Contains 325138 sequences. (Running on oeis4.)