A220408 - OEIS

%I #3 Dec 13 2012 17:43:58

%S 1,23,122,908,6013,41510,273253,1851686,12276677,82620823,550113999,

%T 3691113431,24624350056,164959794914

%N Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 3Xn array

%C Row 3 of A220406

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 13 2012