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A155292 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 229, 1363, 11186, 97334, 991531, 12805571, 217664977, 4668424395, 121771975984 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

............1

...........0.1

..........0.1.0

.........0.1.1.0

........0.0.0.1.0

.......1.1.0.0.0.1

......0.0.1.1.1.0.1

.....0.1.0.1.0.0.1.0

....1.1.1.0.0.0.1.1.0

...0.0.0.1.1.0.0.0.1.0

CROSSREFS

Sequence in context: A155306 A155240 A155298 * A155276 A155270 A155256

Adjacent sequences: A155289 A155290 A155291 * A155293 A155294 A155295

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 8 04:10 EST 2023. Contains 360134 sequences. (Running on oeis4.)