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A220938
Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array
0
1, 37, 556, 9107, 172904, 2876430, 49406891
OFFSET
1,2
COMMENTS
Row 4 of A220935
EXAMPLE
Some solutions for n=3
..0..0..1....0..0..0....0..0..0....0..0..1....0..0..1....0..1..0....0..1..1
..0..1..1....0..0..0....0..0..0....1..1..0....1..0..1....1..0..0....0..0..0
..0..0..1....0..1..0....0..1..0....0..1..1....1..0..0....0..1..1....0..1..1
..1..1..0....0..1..0....1..1..0....0..0..0....0..1..0....1..1..0....0..0..0
CROSSREFS
Sequence in context: A006303 A219440 A219141 * A221292 A231514 A156226
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 25 2012
STATUS
approved