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A155311 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 196, 1148, 8896, 73146, 666416, 7662949, 116153231, 2222900225, 50872655372 (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

.........0.1.0.0

........0.0.1.1.0

.......1.1.0.0.0.1

......0.0.1.0.1.0.1

.....1.1.0.1.1.0.1.0

....1.0.1.0.0.0.1.0.0

...0.0.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A155310 A155288 A155293 * A155289 A155306 A155240

Adjacent sequences:  A155308 A155309 A155310 * A155312 A155313 A155314

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 30 15:50 EDT 2022. Contains 357106 sequences. (Running on oeis4.)