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A155329 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 4,1 4,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 403, 2775, 16917, 98970, 720295, 7051084, 87717398, 1205893340, 18539305616, 340372026066, 7675251517791 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.1.0

.........1.1.1.1

........0.0.0.1.0

.......0.1.0.0.1.0

......1.1.0.0.0.0.1

.....0.1.0.0.0.0.1.0

....0.1.1.0.1.1.1.1.0

...0.0.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155346 A155398 A155431 * A155424 A155349 A155437

Adjacent sequences:  A155326 A155327 A155328 * A155330 A155331 A155332

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 27 09:26 EDT 2022. Contains 354893 sequences. (Running on oeis4.)