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A221187
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nX4 array
0
4, 107, 2648, 51924, 928133, 15638551, 256020803
OFFSET
1,1
COMMENTS
Column 4 of A221188
EXAMPLE
Some solutions for n=3
..1..1..1..0....1..1..0..0....0..1..0..1....1..0..1..0....1..0..0..0
..0..0..0..1....1..0..0..1....0..1..0..0....0..1..0..0....1..0..1..1
..0..0..1..0....1..0..0..1....0..1..0..0....0..1..0..1....1..0..1..1
CROSSREFS
Sequence in context: A104595 A356201 A222930 * A220531 A322085 A128865
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2013
STATUS
approved