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A155404 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 4,0 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 135, 446, 2376, 12035, 65714, 364923, 2734456, 23495580, 245925457, 2738475904, 35447846068, 514467522739 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
LINKS
EXAMPLE
Maximal 9 X 9 X 9 example
...........1
..........1.0
.........0.1.1
........1.1.0.0
.......1.0.1.0.1
......0.0.0.0.0.1
.....1.0.1.0.1.1.0
....0.1.1.0.0.0.1.1
...1.1.0.1.1.0.1.0.1
CROSSREFS
Sequence in context: A061777 A298030 A155369 * A155360 A155382 A155287
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified July 25 14:11 EDT 2024. Contains 374603 sequences. (Running on oeis4.)