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A155447 Number of ways to place zero or more nonadjacent 2,0 3,1 3,2 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 248, 1219, 8302, 40919, 212586, 1454728, 13983083, 157730943, 1851906541, 23225168793, 351573878630, 6540083828707 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..22.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.0.1

..........0.1.1.0

.........1.1.1.0.0

........0.0.0.1.0.0

.......0.0.1.0.1.0.1

......0.1.1.0.0.0.1.0

.....1.1.1.0.1.1.1.0.0

....0.0.0.1.0.0.1.1.0.0

...0.0.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155444 A155439 A155441 * A155340 A155409 A155406

Adjacent sequences:  A155444 A155445 A155446 * A155448 A155449 A155450

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 23 16:13 EST 2022. Contains 350514 sequences. (Running on oeis4.)