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A155261 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 353, 2143, 18201, 203783, 2290841, 37082423, 818768313, 20744782567, 698778878809, 29337409298279 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..16.

EXAMPLE

Maximal 10 X 10 X 10 example

............1

...........1.1

..........0.1.0

.........1.1.0.0

........0.0.0.0.0

.......0.1.1.0.1.0

......1.0.1.1.1.0.1

.....0.1.0.0.0.0.1.0

....1.1.0.1.1.1.0.1.1

...1.1.0.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A155256 A155230 A155231 * A268239 A110672 A213481

Adjacent sequences:  A155258 A155259 A155260 * A155262 A155263 A155264

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 16 22:20 EST 2019. Contains 329208 sequences. (Running on oeis4.)