A155313 - OEIS

A155313

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

1, 7, 25, 55, 97, 1087, 13473, 96815, 552449, 7876407, 210244561, 4886389831, 91609323633, 2669503927735, 132662824311297, 8063542123697063, 467664413878234705

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

OFFSET

3,2

LINKS

Table of n, a(n) for n=3..19.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............1.1

............1.0.1

...........1.0.1.0

..........0.0.0.0.1

.........1.1.0.0.0.1

........1.0.0.0.1.0.1

.......0.1.1.1.0.1.1.0

......0.0.0.0.0.0.0.0.0

.....1.1.0.0.1.0.1.0.1.1

....1.0.1.0.1.0.1.0.1.0.0

...1.0.1.0.0.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A357196 A227776 A155286 * A213390 A071778 A350156

Adjacent sequences: A155310 A155311 A155312 * A155314 A155315 A155316

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved