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A155324 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 133, 535, 2615, 17587, 119298, 919700, 8881748, 102328225, 1400493835, 22807381469, 434028590353 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.1.1

.........0.1.1.0

........0.0.0.1.0

.......0.1.0.0.1.0

......1.1.0.0.0.0.0

.....0.1.1.0.0.0.1.0

....0.1.0.0.1.1.1.1.1

...0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155422 A155370 A155442 * A155325 A155255 A155251

Adjacent sequences:  A155321 A155322 A155323 * A155325 A155326 A155327

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 27 03:01 EDT 2022. Contains 357051 sequences. (Running on oeis4.)