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A155445 Number of ways to place zero or more nonadjacent 1,0 2,1 2,2 3,1 3,3 4,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 19, 40, 123, 434, 1945, 8733, 42692, 242511, 1635703, 12770421, 112939524, 1121434189, 12675288592, 164781726936 (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

..........0.1.1

.........0.1.0.1

........0.0.1.1.0

.......0.1.0.0.1.0

......1.1.0.0.0.0.0

.....1.0.1.0.0.1.1.0

....0.1.1.0.1.1.0.1.1

...0.1.0.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A301160 A097116 A155380 * A133952 A155348 A155269

Adjacent sequences:  A155442 A155443 A155444 * A155446 A155447 A155448

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 22 05:19 EST 2022. Contains 350481 sequences. (Running on oeis4.)