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A155398 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 4,2 5,2 5,3 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 343, 1447, 8149, 47996, 306243, 2223176, 19248076, 198155209, 2388609821, 33179404593 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..20.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.0.1

...........0.0.1.0

..........1.1.1.1.0

.........0.1.0.0.0.0

........0.1.0.0.0.1.0

.......0.0.0.0.0.0.1.1

......0.1.0.0.0.0.0.1.0

.....1.1.1.0.0.0.0.1.0.0

....0.0.0.1.1.1.0.1.1.0.0

...0.0.0.0.1.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155410 A155429 A155346 * A155431 A155329 A155424

Adjacent sequences:  A155395 A155396 A155397 * A155399 A155400 A155401

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 30 08:42 EDT 2022. Contains 354919 sequences. (Running on oeis4.)