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A155346 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,1 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 330, 1713, 11184, 64025, 403539, 3128291, 30538252, 364356710, 4898497176, 73557982663 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.0.0

...........0.0.0.0

..........1.1.0.1.1

.........1.0.0.0.0.1

........0.1.0.0.0.1.0

.......0.1.0.0.0.0.1.0

......1.0.1.1.0.1.1.0.1

.....1.0.0.0.0.0.0.0.0.1

....0.1.1.0.1.0.1.0.1.1.0

...0.0.0.1.1.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155425 A155410 A155429 * A155398 A155431 A155329

Adjacent sequences:  A155343 A155344 A155345 * A155347 A155348 A155349

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 20 11:28 EDT 2019. Contains 325180 sequences. (Running on oeis4.)