A220573 Equals one maps: number of n X n binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 n X n array

1, 8, 91, 17505, 3162375, 4239598056, 12835487766480

Offset

1,2

Comments

Diagonal of A220579

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A234280 A298013 A302614 * A303743 A187157 A332597

Adjacent sequences: A220570 A220571 A220572 * A220574 A220575 A220576

Keyword

nonn

Author

R. H. Hardin Dec 16 2012

Status

approved