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A155289 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 208, 1150, 9013, 76658, 703883, 8056303, 122331252, 2348850844, 54143239435 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

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

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

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

...........1.0.0.0

..........0.1.0.0.1

.........0.1.0.0.0.1

........0.0.0.0.0.0.1

.......1.0.0.1.0.1.1.0

......1.0.0.1.0.1.0.0.0

.....1.0.0.1.0.0.0.0.1.1

....0.1.1.0.1.1.0.1.1.0.1

...0.0.0.1.0.0.1.0.0.0.0.1

CROSSREFS

Sequence in context: A155288 A155293 A155311 * A155306 A155240 A155298

Adjacent sequences: A155286 A155287 A155288 * A155290 A155291 A155292

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 8 14:47 EST 2023. Contains 360146 sequences. (Running on oeis4.)