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A155357 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,0 3,1 4,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 209, 927, 4735, 37071, 286745, 2579963, 31707495, 434469270, 7173015390, 147194484531, 3498010136593 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

Same series for 0,0 1,0 2,1 2,2 3,3 4,3 polyhexes.

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.1.1

..........0.0.1.1

.........1.1.0.1.1

........1.1.0.0.1.1

.......1.1.0.0.0.0.0

......1.1.0.1.1.0.1.1

.....0.0.0.0.1.1.0.1.1

....1.1.1.1.0.1.1.0.1.1

...0.1.1.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A155332 A155388 A155367 * A155248 A027452 A051937

Adjacent sequences:  A155354 A155355 A155356 * A155358 A155359 A155360

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 18 11:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)