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A155423 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 172, 643, 2936, 14954, 84090, 537490, 4238593, 38671134 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..18.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.1

.........1.0.0.1

........0.1.0.1.0

.......0.1.0.0.1.0

......0.0.1.0.1.0.0

.....0.0.1.0.0.1.0.0

....0.0.0.1.0.1.0.0.0

...0.0.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A100545 A203165 A100450 * A155347 A155385 A155345

Adjacent sequences:  A155420 A155421 A155422 * A155424 A155425 A155426

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 17 19:02 EDT 2019. Contains 324198 sequences. (Running on oeis4.)