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A155421 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 4,3 5,4 5,5 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 55, 192, 618, 2255, 11708, 67218, 421461, 2956054, 24412206, 225564175 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..18.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.0

..........0.1.0

.........0.1.0.0

........1.0.1.1.0

.......0.1.0.0.1.1

......0.1.0.0.0.0.0

.....0.0.1.0.0.1.1.0

....0.1.1.0.1.1.0.1.1

...1.1.0.0.1.0.0.0.0.1

CROSSREFS

Sequence in context: A318416 A124697 A155426 * A155343 A155341 A189589

Adjacent sequences:  A155418 A155419 A155420 * A155422 A155423 A155424

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 16 12:15 EDT 2022. Contains 356168 sequences. (Running on oeis4.)