A155386 - OEIS

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A155386

Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 5,0 6,0 7,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 45, 176, 869, 4190, 22684, 124296, 729069, 4981537, 38867913, 351596326

(list; graph; refs; listen; history; text; internal format)

OFFSET

7,2

LINKS

Table of n, a(n) for n=7..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.1

..........1.0.1

.........1.0.0.1

........1.0.0.0.1

.......1.0.0.0.0.1

......1.0.0.0.0.0.1

.....1.0.0.0.0.0.0.1

....1.0.0.0.0.0.0.0.0

...1.0.1.1.1.1.1.1.1.1

CROSSREFS

Sequence in context: A197627 A066229 A149226 * A155330 A155278 A155237

Adjacent sequences: A155383 A155384 A155385 * A155387 A155388 A155389

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved