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A155366 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 4,0 5,0 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 135, 642, 2485, 11927, 77152, 533119, 4074088, 40881018, 462133122 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..17.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.1

.........0.0.1

........1.0.0.1

.......1.1.0.0.1

......1.0.0.0.1.1

.....1.0.0.0.0.0.0

....1.0.0.1.0.0.0.1

...1.1.0.1.1.1.1.1.1

CROSSREFS

Sequence in context: A155279 A155331 A155387 * A340002 A135039 A168559

Adjacent sequences:  A155363 A155364 A155365 * A155367 A155368 A155369

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 25 14:49 EDT 2021. Contains 346290 sequences. (Running on oeis4.)