A203385 Number of nX4 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 252, 65653, 7951793, 781413998, 87523201775, 10639041328647, 1278262639572374, 151324636548284627, 17961671348553838529, 2143180368212187643875, 256021155630985964451501

Offset

1,2

Comments

Column 4 of A203389

Links

R. H. Hardin, Table of n, a(n) for n = 1..173

Example

Some solutions for n=4
..2..2..1..0....6..6..0..0....2..4..6..6....2..6..6..4....3..4..4..3
..3..3..4..4....6..6..5..3....2..4..6..6....2..6..6..6....3..4..4..3
..3..6..6..4....3..5..5..3....6..6..1..0....1..4..6..6....1..2..1..2
..0..6..6..0....0..0..0..0....6..6..0..0....0..4..4..1....0..2..2..2

Crossrefs

Sequence in context: A078263 A289293 A183507 * A248165 A289567 A179714

Adjacent sequences: A203382 A203383 A203384 * A203386 A203387 A203388

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved