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A155281 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 76, 289, 1579, 11207, 100558, 1021474, 12631241, 194406300, 3780423351, 90519767008 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

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

EXAMPLE

Maximal 13 X 13 X 13 example

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

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

.............0.0.1

............1.0.0.1

...........1.0.1.1.0

..........1.0.0.0.0.0

.........1.0.0.0.1.0.0

........0.1.1.0.1.0.1.1

.......1.0.0.0.1.0.1.0.1

......1.0.0.0.1.0.0.0.0.1

.....1.0.0.1.0.1.1.0.1.0.1

....1.0.0.1.0.0.0.0.1.0.0.0

...0.1.1.0.1.1.1.1.0.1.1.1.1

CROSSREFS

Sequence in context: A048477 A294837 A117152 * A155254 A155295 A168589

Adjacent sequences: A155278 A155279 A155280 * A155282 A155283 A155284

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified March 28 07:37 EDT 2023. Contains 361577 sequences. (Running on oeis4.)