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A155435 Number of ways to place zero or more nonadjacent 2,1 2,2 3,0 3,1 3,3 4,2 4,3 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 49, 105, 852, 6079, 29814, 128372, 780418, 9582912, 132900511, 1524452541, 17253579386, 257451880786, 5763064779401, 154341468962518 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..21.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.0

.........0.1.1

........1.1.0.1

.......0.0.1.1.0

......1.1.0.0.0.1

.....1.0.1.0.1.1.0

....0.1.1.0.1.0.1.1

...0.1.0.1.0.1.1.0.0

CROSSREFS

Sequence in context: A272790 A273564 A155392 * A155371 A155355 A155356

Adjacent sequences:  A155432 A155433 A155434 * A155436 A155437 A155438

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 2 06:43 EDT 2022. Contains 357191 sequences. (Running on oeis4.)