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A155409 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 4,2 4,4 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 275, 1767, 10441, 45245, 228435, 1707103, 18329337, 206589973, 2188693403, 25302969335, 385488957361, 7496386108989 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.1

..........1.0.1

.........0.1.1.0

........0.0.0.1.1

.......1.0.0.1.0.0

......1.0.1.0.0.0.0

.....0.1.1.0.1.1.0.1

....1.1.0.0.0.0.1.1.0

...0.0.1.0.0.1.1.0.1.0

CROSSREFS

Sequence in context: A155441 A155447 A155340 * A155406 A155352 A155361

Adjacent sequences:  A155406 A155407 A155408 * A155410 A155411 A155412

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 20 02:24 EDT 2022. Contains 356231 sequences. (Running on oeis4.)