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Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 4Xn array
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%I #3 Dec 16 2012 12:12:35

%S 1,128,375,17505,165130,2652007,33180533,450926562,5905274893,

%T 77665021467

%N Equals one maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 4Xn array

%C Row 4 of A220579

%e Some solutions for n=3

%e ..1..0..1....1..1..0....1..0..1....1..0..1....1..0..1....1..1..0....1..1..1

%e ..1..0..0....0..0..1....1..0..0....1..1..1....1..1..1....0..0..1....1..0..0

%e ..0..1..1....1..1..0....0..0..0....1..0..1....1..1..0....1..1..1....0..0..1

%e ..1..1..0....0..1..0....0..0..1....1..1..1....0..1..1....1..0..1....1..0..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 16 2012