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A155327 Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 3,2 4,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 76, 382, 2724, 16177, 82034, 576215, 5993574, 76883371, 996696560, 14175824222, 255455613029 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.0.1

.........1.1.1.0

........0.0.1.1.0

.......0.1.0.0.1.0

......0.1.0.0.0.0.1

.....1.1.1.0.0.1.1.0

....0.0.1.0.1.1.1.0.0

...0.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155411 A155436 A155440 * A155363 A155395 A155342

Adjacent sequences:  A155324 A155325 A155326 * A155328 A155329 A155330

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 21 04:54 EDT 2019. Contains 326162 sequences. (Running on oeis4.)