A222490 Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 4, 6, 33, 75, 968, 2408, 31222, 77802, 980380, 2576182, 31135264, 86474880, 997925136, 2901220154, 32253476486, 97164153940, 1049389226220, 3251341368326, 34336511340904, 108731869474946, 1128946148580572

Offset

1,2

Comments

Row 3 of A222488

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A331513 A164127 A180139 * A071394 A137021 A176002

Adjacent sequences: A222487 A222488 A222489 * A222491 A222492 A222493

Keyword

nonn

Author

R. H. Hardin Feb 22 2013

Status

approved