A217240 - OEIS

A217240

Number of triangular n X n X n arrays of occupancy after each element moves to some neighbor and with no occupancy greater than 2.

0, 7, 95, 6437, 1175140, 660602643

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

OFFSET

1,2

COMMENTS

Column 2 of A217245.

LINKS

EXAMPLE

Some solutions for n=4

.....2........1........1........1........1........2........0........1

....0.2......0.1......1.1......1.1......2.1......0.1......1.2......0.1

...0.1.1....2.1.2....0.2.1....2.1.2....1.0.1....1.0.1....0.0.1....2.0.1

..0.1.2.1..2.1.0.0..0.2.0.2..1.0.1.0..2.0.2.0..2.2.1.0..1.2.1.2..1.0.2.2

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

R. H. Hardin, Sep 28 2012

STATUS

approved