A208173 Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors

187, 506493, 1496307201, 4422202024212, 13069424064243420, 38625516979536823947, 114154269785454920027391, 337372761040287875038964700, 997075099388051313174129747636

Offset

1,1

Comments

Column 6 of A208175

Links

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

Example

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

Crossrefs

Sequence in context: A208862 A208870 A208877 * A200799 A241118 A208199

Adjacent sequences: A208170 A208171 A208172 * A208174 A208175 A208176

Keyword

nonn

Author

R. H. Hardin Feb 24 2012

Status

approved