A220582 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..1 4Xn array

1, 128, 375, 17505, 165130, 2652007, 33180533, 450926562, 5905274893, 77665021467

Offset

1,2

Comments

Row 4 of A220579

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A234877 A229360 A086059 * A203449 A195090 A209380

Adjacent sequences: A220579 A220580 A220581 * A220583 A220584 A220585

Keyword

nonn

Author

R. H. Hardin Dec 16 2012

Status

approved