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A155442 Number of ways to place zero or more nonadjacent 1,0 2,0 2,2 3,1 3,2 4,1 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 124, 550, 2077, 9417, 59328, 393791, 2721517, 23341616, 236771490, 2617082602 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..19.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.0

...........1.0.1

..........0.1.1.0

.........0.1.0.0.0

........0.1.0.0.1.0

.......0.1.0.0.0.1.0

......0.0.0.0.0.0.1.0

.....1.1.0.0.0.0.0.1.1

....0.0.1.1.1.1.0.1.0.1

...0.1.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155334 A155422 A155370 * A155324 A155325 A155255

Adjacent sequences:  A155439 A155440 A155441 * A155443 A155444 A155445

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 18 19:38 EDT 2021. Contains 344002 sequences. (Running on oeis4.)