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A155417 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 3,2 4,2 5,3 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 103, 427, 2227, 11583, 57485, 387397, 3244887, 30976146, 318914841 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..18.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.0.0.1

.........0.1.1.1.0

........1.1.1.0.0.0

.......1.0.0.0.0.0.0

......0.0.0.1.0.0.1.1

.....0.1.1.1.0.1.1.0.0

....1.1.1.0.0.1.1.0.0.0

...1.0.0.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A155299 A155379 A155243 * A155416 A155391 A155400

Adjacent sequences:  A155414 A155415 A155416 * A155418 A155419 A155420

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 04:28 EDT 2022. Contains 356067 sequences. (Running on oeis4.)