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A155427 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,2 5,3 6,4 7,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 130, 466, 1972, 9920, 52566, 311924, 2236063, 18426118 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..18.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.1

.........0.1.0.1

........0.1.0.1.0

.......0.1.0.1.0.0

......0.0.1.0.1.0.0

.....0.0.1.0.1.0.0.0

....0.0.1.0.1.0.0.0.0

...0.0.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A155268 A124700 A155336 * A155403 A155350 A155312

Adjacent sequences:  A155424 A155425 A155426 * A155428 A155429 A155430

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 16 12:15 EDT 2022. Contains 356168 sequences. (Running on oeis4.)