A207275 - OEIS

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

%S 4,256,121014,553738958,23419301672964

%N Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal

%C Diagonal of A207283

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 16 2012