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A155436 Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,2 3,3 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 76, 284, 1948, 12241, 60886, 350497, 2915669, 33310308, 416154595, 5212602941, 75431474711, 1382363604714, 31384746574285 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........1.0.1.1

........0.1.1.0.0

.......0.1.0.0.1.0

......1.0.0.0.0.1.1

.....0.1.1.0.0.1.0.1

....0.1.0.1.1.0.1.1.0

...0.0.1.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155438 A155396 A155411 * A155440 A155327 A155363

Adjacent sequences:  A155433 A155434 A155435 * A155437 A155438 A155439

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 24 18:55 EDT 2022. Contains 356949 sequences. (Running on oeis4.)