A223106 Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 16, 546, 12330, 198848, 5010580, 82588214, 2138049675, 35334863577, 934309083086, 15507491052968, 415583302042863, 6918422912560024, 187182394471313302, 3123327410493599422, 85104028524065075147

Offset

1,2

Comments

Row 3 of A223104

Links

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

Example

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

Crossrefs

Sequence in context: A196216 A196683 A131515 * A268564 A268566 A189147

Adjacent sequences: A223103 A223104 A223105 * A223107 A223108 A223109

Keyword

nonn

Author

R. H. Hardin Mar 14 2013

Status

approved