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A155393 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 4,3 4,4 5,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 88, 374, 1596, 9550, 53268, 321912, 2348995, 21763014, 230932203, 2808007076, 38499914560, 608992059466 (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

...........1.1

..........0.1.0

.........0.0.1.0

........1.1.1.0.0

.......0.1.0.0.1.1

......0.0.0.0.0.1.0

.....0.1.1.0.0.1.0.0

....1.1.0.1.1.0.1.1.1

...0.1.0.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A155317 A237052 A155381 * A155314 A155321 A155425

Adjacent sequences:  A155390 A155391 A155392 * A155394 A155395 A155396

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 11 09:58 EDT 2022. Contains 356065 sequences. (Running on oeis4.)