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A155348 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,3 4,4 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 19, 43, 128, 488, 2206, 10000, 48377, 276446, 1912377, 15358537, 137081258, 1363205310, 15492211198, 203922791257, 3090086318993 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..22.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........0.1.1.0

........0.1.0.0.1

.......1.1.0.1.1.0

......0.0.1.0.0.1.0

.....0.1.0.0.1.0.1.1

....0.0.1.1.1.0.1.0.0

...0.0.1.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A155380 A155445 A133952 * A155269 A155322 A251176

Adjacent sequences:  A155345 A155346 A155347 * A155349 A155350 A155351

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)