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A155238 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 125, 568, 3422, 27373, 226848, 2490002, 34395449, 564841115, 11835714950, 297683710781, 9228089921657 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..17.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.0

.........1.1.1

........1.0.0.1

.......0.0.0.0.0

......1.1.0.0.1.1

.....1.0.0.0.0.0.1

....1.0.1.0.0.1.0.1

...0.1.0.1.1.1.0.1.0

CROSSREFS

Sequence in context: A155326 A155257 A155224 * A155320 A155279 A155331

Adjacent sequences: A155235 A155236 A155237 * A155239 A155240 A155241

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 1 08:19 EST 2023. Contains 359991 sequences. (Running on oeis4.)