A217505 Number of triangular nXnXn arrays of occupancy after each element either stays or moves to some neighbor and with no occupancy greater than 3

1, 10, 306, 34489, 14162520, 21101953059, 113688398105827

Offset

1,2

Comments

Column 3 of A217510

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
.....0........0........2........0........0........0........2........1
....2.3......2.0......0.0......1.1......0.3......0.1......2.0......3.0
...2.0.2....0.2.0....3.1.0....2.0.2....1.3.3....0.1.2....2.0.0....1.0.2
..0.0.1.0..2.0.2.2..2.1.0.1..1.3.0.0..0.0.0.0..3.2.1.0..0.2.1.1..1.2.0.0

Crossrefs

Sequence in context: A152165 A228188 A041425 * A222972 A119297 A259066

Adjacent sequences: A217502 A217503 A217504 * A217506 A217507 A217508

Keyword

nonn

Author

R. H. Hardin Oct 05 2012

Status

approved