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A155341 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,0 3,1 3,2 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 55, 194, 784, 4435, 26044, 168125, 1273021, 11736308, 129333849, 1686140456, 25343021943, 443460444588 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

Same series for 0,0 1,0 2,0 2,1 3,0 3,1 3,2 4,0 polyhexes.

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

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

...........1.0.1.0

..........1.0.1.1.1

.........0.1.0.0.0.1

........1.1.1.0.0.0.0

.......1.0.0.0.0.0.0.0

......0.0.1.1.0.1.1.0.0

.....0.1.0.0.1.1.0.0.1.0

....0.1.1.0.0.1.0.0.1.1.0

...1.1.0.1.1.0.0.1.1.0.1.1

CROSSREFS

Sequence in context: A155426 A155421 A155343 * A189589 A025576 A189596

Adjacent sequences:  A155338 A155339 A155340 * A155342 A155343 A155344

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 20 22:20 EDT 2019. Contains 325189 sequences. (Running on oeis4.)