A220581 Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 3Xn array

1, 32, 91, 1441, 8334, 64497, 436288, 3036588, 21023792, 146254012, 1011489196, 7016643627, 48603225482, 336693889957, 2332461879768, 16156948253940, 111913294295697, 775187951935208, 5369332881497134, 37190288381188178

Offset

1,2

Comments

Row 3 of A220579

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A318073 A279713 A228801 * A297730 A360436 A124804

Adjacent sequences: A220578 A220579 A220580 * A220582 A220583 A220584

Keyword

nonn

Author

R. H. Hardin Dec 16 2012

Status

approved