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A155424 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,3 4,4 5,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 97, 385, 1752, 10474, 62128, 377334, 2749676, 25769709, 285285035, 3566431622, 50164255930, 808544899113 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.1

..........1.1.0

.........0.0.1.0

........0.0.0.1.1

.......1.0.0.1.0.0

......0.1.1.0.0.0.0

.....0.1.0.0.1.0.0.1

....1.1.0.0.1.1.1.1.0

...0.1.1.0.0.1.0.0.1.0

CROSSREFS

Sequence in context: A155398 A155431 A155329 * A155349 A155437 A155299

Adjacent sequences:  A155421 A155422 A155423 * A155425 A155426 A155427

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)