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A155422 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,1 5,2 6,1 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 118, 502, 1873, 7452, 43554, 288884, 1929451, 15024812, 143416801, 1509097096 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..19.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.1.1.0

.........1.1.0.0.0

........1.0.0.0.1.1

.......0.1.0.0.0.0.1

......0.0.0.0.0.0.1.0

.....0.0.0.1.1.0.0.1.0

....1.0.1.1.0.1.0.1.0.0

...0.1.1.0.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A155359 A098481 A155334 * A155370 A155442 A155324

Adjacent sequences:  A155419 A155420 A155421 * A155423 A155424 A155425

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 16 08:07 EDT 2021. Contains 343940 sequences. (Running on oeis4.)