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A155392 Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,2 4,3 4,4 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 49, 96, 501, 3463, 18127, 74376, 331418, 2409920, 26775212, 305337017, 3047283148, 31207251008, 409221933719 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.0

..........0.1.0

.........0.0.1.1

........1.1.1.0.0

.......0.0.0.1.0.1

......1.0.1.0.0.1.0

.....0.1.1.0.1.1.0.0

....0.1.0.1.0.0.1.1.1

...0.1.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A273557 A272790 A273564 * A155435 A155371 A155355

Adjacent sequences: A155389 A155390 A155391 * A155393 A155394 A155395

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 5 01:43 EST 2022. Contains 358572 sequences. (Running on oeis4.)