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A155235 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 37, 152, 704, 5022, 42621, 420222, 5313446, 83504848, 1668949583, 41600395450, 1285489016880, 49769130940759 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..17.

EXAMPLE

Maximal 13 X 13 X 13 example

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

..............1.0

.............1.1.0

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

...........0.0.0.0.1

..........0.1.0.0.1.1

.........1.0.1.0.0.0.1

........1.0.1.1.0.1.0.0

.......1.1.0.0.1.0.1.1.0

......1.0.0.0.0.0.0.1.0.1

.....0.0.1.1.1.1.0.0.1.0.1

....0.1.0.0.1.0.0.1.0.0.1.1

...1.1.1.1.0.0.1.1.1.1.0.0.1

CROSSREFS

Sequence in context: A155307 A155344 A155418 * A024450 A047094 A145128

Adjacent sequences:  A155232 A155233 A155234 * A155236 A155237 A155238

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 26 10:12 EDT 2019. Contains 324375 sequences. (Running on oeis4.)