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A155242 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 70, 235, 1578, 9621, 89416, 823589, 11073433, 160764354, 3227749885, 73045396627, 2178986476482 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..17.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.1.1

..........0.0.0.1

.........1.1.1.0.1

........1.0.0.0.0.0

.......1.0.0.0.1.1.1

......0.0.0.0.0.0.0.1

.....1.0.1.1.1.0.1.0.1

....0.1.0.0.0.1.0.1.0.0

...0.0.1.1.1.0.1.0.1.1.1

CROSSREFS

Sequence in context: A193643 A228026 A122484 * A155333 A155296 A155463

Adjacent sequences: A155239 A155240 A155241 * A155243 A155244 A155245

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 8 19:12 EST 2022. Contains 358698 sequences. (Running on oeis4.)