A217230 Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor but without 2-loops and with no occupancy greater than 4.

0, 1, 47, 5167, 1950380, 2709368919

Offset

1,3

Comments

Column 4 of A217232.

Links

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

Example

Some solutions for n=4
.....1........0........0........0........0........0........0........1
....2.1......1.1......2.2......2.0......1.1......1.0......0.2......1.2
...2.0.1....2.1.0....0.2.3....1.2.0....0.2.0....0.4.1....3.1.1....1.0.1
..0.2.1.0..0.3.2.0..0.1.0.0..0.3.1.1..0.3.2.1..1.2.1.0..1.1.0.1..1.2.0.1

Crossrefs

Sequence in context: A334180 A194617 A217229 * A217231 A141797 A101629

Adjacent sequences: A217227 A217228 A217229 * A217231 A217232 A217233

Keyword

nonn,hard,more

Author

R. H. Hardin, Sep 28 2012

Status

approved