A223131 Number of 6Xn 0..2 arrays with no more than floor(6Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

122, 47968, 18539512, 7157970340, 2785187722316, 1092037282618789, 431398785877769642, 171546088917546382811, 68597654261623347505569, 27560231488082950954805851

Offset

1,1

Comments

Row 6 of A223126

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A233080 A280678 A209105 * A208256 A198714 A199653

Adjacent sequences: A223128 A223129 A223130 * A223132 A223133 A223134

Keyword

nonn

Author

R. H. Hardin Mar 15 2013

Status

approved