A217241 Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor and with no occupancy greater than 3.

0, 7, 161, 17957, 6839199, 9594137076

Offset

1,2

Comments

Column 3 of A217245

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
.....0........0........1........1........2........1........2........1
....1.1......2.3......0.3......0.2......2.0......0.1......1.1......1.1
...0.2.1....1.1.1....2.0.1....0.2.1....1.0.0....2.2.1....2.3.1....2.0.1
..0.3.0.2..0.0.0.2..1.0.0.2..2.1.0.1..0.2.1.2..0.2.1.0..0.0.0.0..1.2.0.1

Crossrefs

Sequence in context: A214350 A208263 A160454 * A317727 A142163 A201179

Adjacent sequences: A217238 A217239 A217240 * A217242 A217243 A217244

Keyword

nonn,hard,more

Author

R. H. Hardin Sep 28 2012

Status

approved