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A155378 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,2 4,3 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 67, 314, 2337, 14010, 66473, 405331, 3843288, 47944694, 600390745, 7673166649, 120741723116, 2464557255202 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........0.1.1.1

........0.1.1.1.0

.......0.0.0.0.1.0

......0.0.1.0.0.0.1

.....1.1.1.0.1.1.1.0

....0.1.1.1.0.1.1.1.0

...0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A155412 A155420 A155434 * A155438 A155396 A155411

Adjacent sequences:  A155375 A155376 A155377 * A155379 A155380 A155381

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 18 14:12 EST 2022. Contains 350455 sequences. (Running on oeis4.)