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A155239 Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 144, 940, 6913, 44442, 383165, 4775804, 73750670, 1270986469, 26693174009, 724206936085, 24621385504435 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 8 X 8 X 8 example

..........0

.........0.1

........1.1.0

.......0.0.1.0

......0.1.0.1.0

.....0.1.0.0.0.1

....1.1.0.1.1.1.0

...0.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A155325 A155255 A155251 * A217421 A155376 A155377

Adjacent sequences: A155236 A155237 A155238 * A155240 A155241 A155242

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 1 08:18 EST 2023. Contains 359987 sequences. (Running on oeis4.)