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A220808
Equals one maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nX4 array
1
8, 168, 3466, 62400, 1037774, 16734366, 268264812, 4294285044, 68716748256, 1099500713960, 17592142389240, 281474802089984, 4503598928887808, 72057591243997184, 1152921493431123968, 18446744029006659584
OFFSET
1,1
COMMENTS
Column 4 of A220810
LINKS
FORMULA
Empirical: a(n) = 20*a(n-1) -64*a(n-2) for n>13
EXAMPLE
Some solutions for n=3
..0..1..0..0....0..0..1..1....0..0..1..1....0..1..1..0....1..0..1..1
..1..0..0..1....1..1..0..1....1..1..0..1....1..0..0..1....0..0..1..0
..0..0..0..0....0..0..0..0....0..0..1..0....1..1..0..0....0..0..0..0
CROSSREFS
Sequence in context: A316756 A294512 A090228 * A221022 A039699 A307347
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 22 2012
STATUS
approved