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A155395 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 304, 1597, 8409, 37756, 200483, 1450289, 12807392, 119527765, 1178177160 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.0.0

.........0.0.0.0

........0.1.1.1.0

.......1.1.0.0.0.0

......1.0.1.0.0.0.1

.....1.0.0.0.1.0.1.0

....0.0.0.0.0.1.1.0.0

...0.0.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A155440 A155327 A155363 * A155342 A155408 A155358

Adjacent sequences:  A155392 A155393 A155394 * A155396 A155397 A155398

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 23 00:50 EDT 2019. Contains 326211 sequences. (Running on oeis4.)