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A155425 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 3,3 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 289, 1342, 7169, 33736, 187935, 1191407, 9471948, 87427106, 862847938 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..19.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.0.0

...........1.0.0.1

..........0.1.1.1.0

.........1.0.0.0.1.0

........0.1.0.0.0.1.1

.......0.1.0.0.0.0.0.0

......1.1.0.0.0.0.0.1.1

.....0.0.1.0.0.0.0.1.0.0

....0.0.0.1.0.1.1.1.0.0.0

...0.0.0.1.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155393 A155314 A155321 * A155410 A155429 A155346

Adjacent sequences:  A155422 A155423 A155424 * A155426 A155427 A155428

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 28 11:37 EDT 2022. Contains 354905 sequences. (Running on oeis4.)