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A155408 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,1 3,2 4,3 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 389, 2228, 11375, 55979, 368808, 3167853, 30342483, 321262692, 3912167616, 56990411793 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........0.0.1.1

........0.0.1.1.0

.......0.0.0.0.1.1

......0.1.1.0.0.0.0

.....1.1.0.0.0.1.0.1

....0.1.1.0.1.1.1.1.0

...1.1.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A155363 A155395 A155342 * A155358 A155353 A155317

Adjacent sequences:  A155405 A155406 A155407 * A155409 A155410 A155411

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 20 15:13 EDT 2019. Contains 326152 sequences. (Running on oeis4.)