A207128 - OEIS

%I #6 Dec 18 2015 18:18:00

%S 4,256,197144,1981367324,264331974554825,466503557360950708206

%N Number of n X n 0..3 arrays avoiding the pattern z z+1 z in any row or column

%C Diagonal of A207134

%e Some solutions for n=4

%e ..1..0..0..0....2..2..1..0....1..0..3..2....0..2..2..1....2..3..1..3

%e ..0..3..1..2....3..2..2..0....1..1..0..0....1..0..1..1....2..2..1..1

%e ..1..0..1..3....3..3..3..0....3..1..3..0....2..2..1..0....3..2..0..1

%e ..1..3..3..1....1..3..3..2....1..0..1..3....0..3..0..0....0..3..3..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 15 2012