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A155344 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 37, 146, 632, 2601, 11932, 76177, 558787, 4627682, 46978044, 543470526 (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

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

..........0.1

.........1.0.1

........1.0.1.0

.......0.1.0.1.0

......0.1.0.0.1.1

.....1.1.0.0.0.0.1

....1.0.0.1.1.1.0.0

...0.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A108489 A155375 A155307 * A155418 A155235 A024450

Adjacent sequences:  A155341 A155342 A155343 * A155345 A155346 A155347

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 22 19:16 EDT 2019. Contains 323481 sequences. (Running on oeis4.)