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A155336 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 112, 333, 1722, 11278, 66471, 421203, 3100169, 28603780, 333898461, 4399044128, 64174608851 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............0.0

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

..........1.0.0.1

.........0.0.0.0.1

........0.0.0.0.1.0

.......1.1.0.0.0.0.0

......1.0.0.1.0.1.1.1

.....1.0.0.1.0.1.0.0.1

....0.1.0.0.1.0.0.1.0.1

...0.0.1.1.0.1.1.1.0.1.0

CROSSREFS

Sequence in context: A155275 A155268 A124700 * A155427 A155403 A155350

Adjacent sequences:  A155333 A155334 A155335 * A155337 A155338 A155339

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified April 18 14:58 EDT 2021. Contains 343089 sequences. (Running on oeis4.)