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A155328 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,0 5,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 45, 200, 827, 3807, 19771, 133675, 1067815, 10084717, 113366836, 1442256377 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 8 X 8 X 8 example

..........1

.........0.1

........1.0.1

.......1.0.1.1

......1.0.0.0.1

.....1.1.0.0.0.1

....1.0.0.0.1.0.0

...1.0.1.1.1.1.1.1

CROSSREFS

Sequence in context: A149431 A149432 A155397 * A096353 A034553 A320743

Adjacent sequences:  A155325 A155326 A155327 * A155329 A155330 A155331

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 15:22 EDT 2022. Contains 356077 sequences. (Running on oeis4.)