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A155384 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 64, 310, 1325, 5981, 32023, 203050, 1519404, 13409104, 137343202 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.1.0

.........1.1.0.1

........1.1.0.0.1

.......1.0.0.0.0.1

......1.0.0.0.0.1.1

.....0.0.0.0.0.0.1.0

....1.1.1.1.0.0.0.1.0

...0.0.0.1.1.1.1.0.1.0

CROSSREFS

Sequence in context: A259797 A155338 A155401 * A155218 A305483 A046137

Adjacent sequences:  A155381 A155382 A155383 * A155385 A155386 A155387

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 17 04:58 EDT 2019. Contains 327119 sequences. (Running on oeis4.)