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A155382 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 4,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 141, 496, 2636, 13567, 76878, 469481, 3693548, 33420872, 360497441, 4317343069, 60086409152 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.1

.........0.1.1

........0.1.0.0

.......1.1.1.0.1

......0.0.0.0.1.0

.....1.0.1.0.1.1.0

....1.1.1.1.0.0.1.0

...1.0.0.0.1.0.1.1.1

CROSSREFS

Sequence in context: A155369 A155404 A155360 * A155287 A155337 A155402

Adjacent sequences:  A155379 A155380 A155381 * A155383 A155384 A155385

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 15 12:44 EDT 2019. Contains 327078 sequences. (Running on oeis4.)