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A155350 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 139, 529, 2779, 14903, 85160, 631076, 5508964, 55342292, 627643346 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..18.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.0.0

..........0.0.0.1

.........0.1.1.1.0

........0.1.0.0.0.0

.......1.1.0.0.0.0.0

......0.0.0.1.0.0.0.1

.....0.1.1.1.0.1.1.1.0

....0.1.0.0.0.1.0.0.0.0

...1.1.0.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A155336 A155427 A155403 * A155312 A155351 A155430

Adjacent sequences:  A155347 A155348 A155349 * A155351 A155352 A155353

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 16 17:49 EDT 2019. Contains 328102 sequences. (Running on oeis4.)