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A155330 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 5,0 6,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 45, 176, 869, 4190, 22684, 124296, 845950, 6444330, 59042752 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.0

.........1.0.1

........1.0.0.1

.......1.0.0.0.1

......1.0.0.0.0.1

.....1.0.0.0.0.0.1

....0.0.0.0.0.0.0.1

...1.1.1.1.1.1.1.0.1

CROSSREFS

Sequence in context: A066229 A149226 A155386 * A155278 A155237 A155223

Adjacent sequences:  A155327 A155328 A155329 * A155331 A155332 A155333

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 07:45 EDT 2022. Contains 356067 sequences. (Running on oeis4.)