A221662 Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array

1, 128, 2735, 58710, 1016831, 16705642, 268216870, 4294510063, 68718137467, 1099507659647, 17592163496919

Offset

1,2

Comments

Row 4 of A221660

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A236209 A283548 A297687 * A250282 A019564 A224163

Adjacent sequences: A221659 A221660 A221661 * A221663 A221664 A221665

Keyword

nonn

Author

R. H. Hardin Jan 21 2013

Status

approved