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A155377 Number of ways to place zero or more nonadjacent 1,1 2,1 3,1 3,2 4,0 4,1 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 153, 637, 2331, 11267, 74210, 497308, 3765392, 35883138, 379301928, 4460755344 (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

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

..........0.1.1

.........0.0.1.0

........0.1.0.1.0

.......0.1.0.1.1.0

......0.1.1.0.0.1.0

.....1.1.0.0.1.0.0.0

....0.1.0.1.1.1.1.1.1

...0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155239 A217421 A155376 * A155227 A155319 A155318

Adjacent sequences:  A155374 A155375 A155376 * A155378 A155379 A155380

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 19 17:26 EST 2022. Contains 350466 sequences. (Running on oeis4.)