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A155343 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 55, 192, 702, 3882, 23422, 155527, 1170160, 10636314, 113496925, 1456900734, 21993819116 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.1.0

...........1.1.1.1

..........1.0.0.0.1

.........0.0.1.1.0.0

........0.1.1.0.0.1.0

.......1.0.1.0.1.1.1.1

......1.0.1.0.1.0.0.0.1

.....0.1.0.1.0.0.0.1.0.0

....0.1.1.0.0.0.1.1.1.1.0

...0.0.0.1.1.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A124697 A155426 A155421 * A155341 A189589 A025576

Adjacent sequences:  A155340 A155341 A155342 * A155344 A155345 A155346

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 19 08:33 EDT 2019. Contains 325155 sequences. (Running on oeis4.)