A207311 - OEIS

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

%S 3,81,15390,21162579,205235353935,14121763303437256,

%T 6886304943923084187412,23820527297958550757568717516,

%U 584573521981314585923770355820671056

%N Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal

%C Diagonal of A207317

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 16 2012