A221294 Equals two maps: number of 6Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 6Xn array

1, 351, 19996, 1686304, 143511784, 10344276279

Offset

1,2

Comments

Row 6 of A221290

Links

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

Example

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

Crossrefs

Sequence in context: A264426 A231707 A220333 * A220686 A167820 A145633

Adjacent sequences: A221291 A221292 A221293 * A221295 A221296 A221297

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved