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A155240 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 208, 1905, 20926, 172576, 1900996, 35023141, 893053190, 24012955958, 788590457332, 36088248750672 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

Same series for 1,1 2,1 2,2 3,0 3,1 3,2 polyhexes.

LINKS

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

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.1

...........1.0.1

..........0.0.0.1

.........1.0.0.0.0

........1.0.0.0.1.1

.......0.1.1.1.0.0.1

......0.0.0.0.0.0.1.0

.....1.1.1.0.1.0.1.0.1

....1.0.0.0.0.1.0.0.0.1

...0.1.0.1.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A155311 A155289 A155306 * A155298 A155292 A155276

Adjacent sequences: A155237 A155238 A155239 * A155241 A155242 A155243

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 26 17:00 EST 2022. Contains 358362 sequences. (Running on oeis4.)