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A155400 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 5,2 6,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 106, 414, 1792, 8692, 50965, 347596, 2639357, 22946779, 235883238, 2823234704 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.0.1.1

.........0.1.1.0.0

........1.1.0.0.1.1

.......0.1.0.0.0.1.0

......1.0.0.0.0.0.1.0

.....1.1.1.0.0.0.1.0.0

....0.0.0.1.1.1.0.1.0.0

...0.0.0.0.0.1.0.1.1.0.0

CROSSREFS

Sequence in context: A155417 A155416 A155391 * A155359 A098481 A155334

Adjacent sequences:  A155397 A155398 A155399 * A155401 A155402 A155403

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 6 08:24 EDT 2021. Contains 343580 sequences. (Running on oeis4.)