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A155440 Number of ways to place zero or more nonadjacent 1,0 2,0 2,2 3,0 3,2 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 76, 332, 1823, 10749, 53165, 313295, 2436626, 24495034, 277288339, 3304478802, 44732292922, 736452039398 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 1,1 2,0 2,1 3,2 3,3 4,2 4,3 5,4 polyhexes.

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.1

..........1.0.1

.........0.1.0.1

........0.0.1.1.0

.......0.1.0.0.1.0

......1.1.0.0.0.0.0

.....1.0.1.0.0.1.1.1

....1.0.1.0.1.1.0.0.0

...0.0.1.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A155396 A155411 A155436 * A155327 A155363 A155395

Adjacent sequences:  A155437 A155438 A155439 * A155441 A155442 A155443

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)