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A155430 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,3 5,4 6,5 7,5 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 186, 802, 3291, 15504, 87663, 541655, 3932774, 33121807 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

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

EXAMPLE

Maximal 11 X 11 X 11 example

.............1

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

...........0.1.0

..........0.1.0.1

.........0.1.0.1.0

........0.1.0.0.1.0

.......0.1.0.0.0.1.0

......0.0.1.0.0.0.1.0

.....0.0.0.0.0.1.0.1.0

....1.1.1.1.1.1.0.0.1.0

...1.0.0.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155350 A155312 A155351 * A155247 A113927 A155399

Adjacent sequences:  A155427 A155428 A155429 * A155431 A155432 A155433

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 15:13 EDT 2022. Contains 356077 sequences. (Running on oeis4.)