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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
0
1, 1081, 119972, 22931365, 4129628435, 618825190371
OFFSET
1,2
COMMENTS
Row 7 of A221290
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2013
STATUS
approved