A220334 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..1 7Xn array

1, 1081, 84196, 10004541, 1026529800, 119808040854

Offset

1,2

Comments

Row 7 of A220328

Links

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

Example

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

Crossrefs

Sequence in context: A338407 A078214 A251199 * A221295 A220687 A188240

Adjacent sequences: A220331 A220332 A220333 * A220335 A220336 A220337

Keyword

nonn

Author

R. H. Hardin Dec 10 2012

Status

approved