A217242 Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor and with no occupancy greater than 4.

0, 7, 182, 22484, 10146841, 17541907856

Offset

1,2

Comments

Column 4 of A217245

Links

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

Example

Some solutions for n=4
.....1........2........0........0........0........0........0........0
....2.0......0.2......0.2......3.2......2.0......1.1......2.0......1.4
...3.1.0....1.0.0....0.1.4....1.1.0....3.0.1....2.0.0....1.4.0....1.0.1
..0.2.1.0..0.2.2.1..0.2.1.0..0.1.1.1..1.1.2.0..2.0.2.2..0.0.2.1..1.0.2.0

Crossrefs

Sequence in context: A302904 A059382 A158620 * A217243 A217244 A152436

Adjacent sequences: A217239 A217240 A217241 * A217243 A217244 A217245

Keyword

nonn,hard,more

Author

R. H. Hardin Sep 28 2012

Status

approved