A204774 - OEIS

%I #5 Mar 31 2012 12:37:03

%S 2592,2973696,21570701058,966430412947296,270709468240858645320,

%T 471676730359800501277345350,5121078716739687209206582420410120

%N Number of (n+2)X(n+2) 0..2 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..2 introduced in row major order

%C Diagonal of A204782

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 19 2012