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A155338 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 64, 199, 919, 4123, 24600, 145752, 1212971, 10549470, 114622513 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.0.0

..........0.1.0.0

.........0.0.1.1.1

........0.0.0.0.0.1

.......0.0.1.0.0.0.1

......0.0.1.0.0.0.0.0

.....1.1.1.0.0.0.1.1.1

....1.0.0.0.0.0.1.0.0.0

...1.0.0.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A165683 A092359 A259797 * A155401 A155384 A155218

Adjacent sequences:  A155335 A155336 A155337 * A155339 A155340 A155341

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified April 18 13:57 EDT 2021. Contains 343088 sequences. (Running on oeis4.)