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A155410 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,2 3,3 4,2 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 297, 1458, 9766, 53099, 308101, 2235851, 20215398, 229099105, 2888943253, 39401146662, 624852187290 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 1,0 1,1 2,0 3,0 3,1 4,1 5,2 5,3 polyhexes.

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.0

..........1.1.0

.........0.1.0.0

........1.1.0.0.0

.......0.0.1.0.1.1

......1.0.1.1.0.1.0

.....1.1.0.0.0.0.1.1

....0.0.1.1.1.0.1.0.0

...0.0.1.0.1.0.1.1.0.0

CROSSREFS

Sequence in context: A155314 A155321 A155425 * A155429 A155346 A155398

Adjacent sequences:  A155407 A155408 A155409 * A155411 A155412 A155413

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 5 14:18 EDT 2022. Contains 355099 sequences. (Running on oeis4.)