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A155411 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 4,1 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 76, 258, 1393, 9223, 50174, 277825, 1912295, 17811734, 207588822, 2624271308, 35563828726, 553613643453 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........1.0.1.1

........0.0.1.0.1

.......1.1.0.0.1.0

......1.0.0.0.0.0.1

.....0.1.1.0.0.1.0.1

....0.1.0.0.1.0.1.1.0

...0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155378 A155438 A155396 * A155436 A155440 A155327

Adjacent sequences:  A155408 A155409 A155410 * A155412 A155413 A155414

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 9 06:39 EDT 2022. Contains 356017 sequences. (Running on oeis4.)