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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A221188 LINKS 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: A087178 A104595 A222930 * A220531 A322085 A128865 Adjacent sequences:  A221184 A221185 A221186 * A221188 A221189 A221190 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2013 STATUS approved

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Last modified January 20 08:18 EST 2020. Contains 331081 sequences. (Running on oeis4.)