A206569 - OEIS

%I #6 Dec 18 2015 18:17:59

%S 4,256,188699,1665431164,176372042982658,224922074723556223280

%N Number of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal

%C Diagonal of A206577

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 09 2012