A192487 Half the number of n X n X n triangular binary arrays with every element equal to at most 5 neighbors.

1, 4, 32, 504, 15704, 967040, 117706400, 28318463392, 13466466727872, 12657620455508224, 23516077513008447744, 86355918572493456505728, 626806864356196966410513920, 8992693476394949632573847880832

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for 5 X 5 X 5 with a(1,1) = 0
......0..........0..........0..........0..........0..........0..........0
.....0.0........0.0........0.0........1.0........0.1........0.0........1.0
....0.1.1......0.1.1......0.1.1......0.1.0......1.1.1......1.0.0......0.0.1
...1.1.1.1....1.0.1.1....0.0.1.1....1.1.0.0....1.0.1.1....1.1.0.0....1.0.0.1
..0.1.0.1.0..1.0.0.1.0..1.0.0.0.0..1.0.1.0.0..1.0.1.0.0..0.0.1.1.0..0.0.0.1.1

Crossrefs

Sequence in context: A086906 A034663 A192501 * A093581 A102557 A144935

Adjacent sequences: A192484 A192485 A192486 * A192488 A192489 A192490

Keyword

nonn

Author

R. H. Hardin, Jul 02 2011

Status

approved