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A155298 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 229, 1191, 8727, 74357, 700043, 7963463, 116098934, 2137593164, 48102627816 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..16.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........1.0.0.1

.........1.0.0.0.0

........0.0.0.1.1.1

.......1.1.0.1.0.0.0

......1.0.0.1.0.1.1.1

.....1.0.1.0.1.0.0.0.1

....0.1.0.1.0.0.1.0.0.1

...0.0.1.0.1.1.1.0.0.1.0

CROSSREFS

Sequence in context: A155289 A155306 A155240 * A155292 A155276 A155270

Adjacent sequences: A155295 A155296 A155297 * A155299 A155300 A155301

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 8 15:16 EST 2023. Contains 360149 sequences. (Running on oeis4.)