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A155345 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,1 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 193, 781, 3781, 20901, 131341, 1017012, 9065243, 91925870 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.1.0

...........0.1.0.0

..........0.1.0.0.0

.........0.0.1.0.0.1

........0.0.1.0.0.0.1

.......1.1.0.0.0.0.1.0

......0.0.1.1.1.0.0.1.0

.....1.1.0.0.0.1.1.0.1.0

....0.0.1.1.1.0.0.0.1.0.0

...0.0.0.0.0.1.1.0.0.1.0.0

CROSSREFS

Sequence in context: A155423 A155347 A155385 * A155309 A155419 A155246

Adjacent sequences:  A155342 A155343 A155344 * A155346 A155347 A155348

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 19 08:33 EDT 2019. Contains 325155 sequences. (Running on oeis4.)