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A155231 Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 259, 2433, 26055, 255284, 3429704, 71355614, 1963935839, 63893300754, 2652285259513, 148465098222315 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..16.

EXAMPLE

Maximal 13 X 13 X 13 example

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

..............1.0

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

............0.0.0.1

...........0.1.1.0.0

..........1.0.0.1.1.0

.........1.1.1.0.1.0.1

........0.0.0.1.0.0.1.1

.......0.1.1.0.0.1.1.0.0

......1.0.1.0.1.0.0.0.1.0

.....1.0.1.0.1.0.1.1.1.0.1

....0.1.0.1.0.1.0.1.0.0.1.1

...0.1.1.0.0.1.1.0.0.1.1.0.0

CROSSREFS

Sequence in context: A155270 A155256 A155230 * A155261 A268239 A110672

Adjacent sequences:  A155228 A155229 A155230 * A155232 A155233 A155234

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 16 17:04 EST 2019. Contains 329201 sequences. (Running on oeis4.)