|
%I
%S 1,128,2735,58710,1016831,16705642,268216870,4294510063,68718137467,
%T 1099507659647,17592163496919
%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..2 4Xn array
%C Row 4 of A221660
%e Some solutions for n=3
%e ..0..1..1....0..1..1....0..0..1....0..1..1....0..0..1....1..0..1....1..0..0
%e ..0..0..0....1..1..0....1..1..1....0..0..1....0..0..0....0..1..0....1..1..0
%e ..0..1..1....1..1..1....0..1..0....1..1..1....0..1..0....1..1..0....0..0..0
%e ..1..1..0....1..0..1....1..0..0....0..1..1....0..0..0....1..1..1....0..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 21 2013
| 