A223043 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

5, 105, 3780, 229437, 8580619, 545607733, 20971228220, 1358651862708, 53077561321144, 3474963120998767, 137187655129561217, 9041338739497666603, 359601802489393277805, 23807690292325473464228, 952177664603231816246021

Offset

1,1

Comments

Row 3 of A223041

Links

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

Example

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

Crossrefs

Sequence in context: A273966 A114481 A273962 * A200851 A203471 A015002

Adjacent sequences: A223040 A223041 A223042 * A223044 A223045 A223046

Keyword

nonn

Author

R. H. Hardin Mar 12 2013

Status

approved