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A155418 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,1 5,0 5,1 6,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 37, 146, 650, 2757, 12196, 62521, 379032, 2723899, 22610728 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

............1

...........0.1

..........0.1.0

.........1.0.1.0

........1.0.0.1.0

.......0.1.0.0.1.1

......0.1.0.0.0.0.1

.....0.1.0.0.0.0.0.0

....1.1.0.0.1.1.1.1.0

...1.0.0.1.1.0.0.0.1.1

CROSSREFS

Sequence in context: A155375 A155307 A155344 * A155235 A024450 A047094

Adjacent sequences:  A155415 A155416 A155417 * A155419 A155420 A155421

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)