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A155368 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,0 3,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 19, 34, 55, 406, 2950, 17731, 91675, 408976, 3333241, 44182549, 642260617, 9294897961, 125470980640, 2040625065922, 47345357523907, 1393444080049042 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..21.

EXAMPLE

Maximal 10 X 10 X 10 example

............1

...........1.0

..........1.1.1

.........1.0.1.1

........0.0.0.0.0

.......0.1.1.0.1.0

......1.0.1.1.1.0.1

.....0.1.0.0.1.0.1.1

....1.1.1.0.1.0.0.1.0

...1.1.0.1.0.0.1.1.1.1

CROSSREFS

Sequence in context: A301194 A015616 A022905 * A301155 A301215 A155389

Adjacent sequences:  A155365 A155366 A155367 * A155369 A155370 A155371

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 20 09:06 EDT 2021. Contains 348099 sequences. (Running on oeis4.)