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A155243 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 102, 1264, 9091, 48176, 418130, 8182255, 143523182, 2278072430, 53254810257, 2027413206531, 84728501324609, 3776435859240528, 226344677177142828, 18987749209358606115, 1902812184280545994272 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

Same series for 1,0 1,1 2,1 2,2 3,1 3,2 polyhexes.

LINKS

Table of n, a(n) for n=3..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.1

..........1.0.1

.........0.0.1.0

........1.1.0.0.1

.......1.0.0.1.0.1

......0.1.1.0.1.1.0

.....1.0.0.0.0.0.0.1

....1.0.1.0.0.0.1.0.1

...0.1.1.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A155437 A155299 A155379 * A155417 A155416 A155391

Adjacent sequences:  A155240 A155241 A155242 * A155244 A155245 A155246

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 6 05:47 EDT 2022. Contains 357261 sequences. (Running on oeis4.)