A203341 Number of nX3 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 25, 635, 9555, 142167, 2566719, 48091042, 870803077, 15677729113, 285592250536, 5229626169635, 95709720070629, 1751500859436863, 32083750075804047, 588112814640699586, 10783024853712580946

Offset

1,2

Comments

Column 3 of A203346

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..2..4..4....1..4..4....3..3..2....2..3..3....4..4..3....1..2..2....4..4..2
..3..4..4....2..4..4....3..3..2....2..4..4....4..4..3....3..4..4....4..4..4
..3..3..2....2..0..0....4..4..3....1..4..4....4..0..3....3..4..4....0..3..4
..2..2..0....2..2..0....4..4..4....0..4..4....4..4..4....1..3..3....0..4..4
..0..0..0....2..2..0....1..4..4....0..2..2....4..4..4....0..3..3....0..4..4

Crossrefs

Sequence in context: A171299 A009969 A042202 * A260048 A152256 A153111

Adjacent sequences: A203338 A203339 A203340 * A203342 A203343 A203344

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved