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A155337 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 161, 562, 3058, 15699, 98124, 620233, 5239100, 48386446, 558536676, 7037622489, 106784846181 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.0

.........1.1.1

........1.0.0.0

.......1.0.1.1.1

......0.1.0.0.0.1

.....1.0.1.0.1.0.1

....0.1.0.0.1.0.1.0

...0.0.1.1.1.0.1.0.0

CROSSREFS

Sequence in context: A155360 A155382 A155287 * A155402 A155232 A188281

Adjacent sequences:  A155334 A155335 A155336 * A155338 A155339 A155340

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 25 12:53 EST 2021. Contains 341607 sequences. (Running on oeis4.)