A222692 Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 8, 32, 220, 664, 7248, 25642, 298371, 1096152, 12945294, 48211246, 573628264, 2151355010, 25742089966, 97071821386, 1166397676786, 4417183199796, 53250737244290, 202351443983488, 2445862968089744, 9320019295610972

Offset

1,2

Comments

Row 3 of A222690

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Example

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

Crossrefs

Sequence in context: A129798 A129792 A224664 * A268143 A093759 A066415

Adjacent sequences: A222689 A222690 A222691 * A222693 A222694 A222695

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved