A221295 Equals two maps: number of 7Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 7Xn array

1, 1081, 119972, 22931365, 4129628435, 618825190371

Offset

1,2

Comments

Row 7 of A221290

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A078214 A251199 A220334 * A220687 A188240 A165809

Adjacent sequences: A221292 A221293 A221294 * A221296 A221297 A221298

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved