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A155363 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 4,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 79, 331, 1971, 11437, 56649, 326778, 2556228, 26440896, 303972325, 3581795416, 47721457149, 785585027118 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........1.1.1.0

........1.0.0.0.1

.......1.1.0.1.1.1

......0.0.1.0.0.0.1

.....0.1.0.0.1.0.1.1

....0.0.1.0.1.0.1.0.0

...0.0.1.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A155436 A155440 A155327 * A155395 A155342 A155408

Adjacent sequences:  A155360 A155361 A155362 * A155364 A155365 A155366

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 26 03:18 EDT 2019. Contains 326324 sequences. (Running on oeis4.)