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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified June 25 02:21 EDT 2024. Contains 373691 sequences. (Running on oeis4.)