%I #6 Mar 31 2012 12:37:01
%S 144,4050,259808,25233408,5406738528,2134049909922,1597165262402016,
%T 2318118449955569282,6416215460503014746112,
%U 33850489754410068455670578,342799382812784238626135423232,6643766502379498331477812982056992
%N Number of (n+2)X(n+2) 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order
%C Diagonal of A204398
%H R. H. Hardin, <a href="/A204390/b204390.txt">Table of n, a(n) for n = 1..16</a>
%e Some solutions for n=3
%e ..0..1..1..0..1....0..0..0..1..1....0..1..0..1..1....0..1..1..1..0
%e ..0..1..0..1..1....0..1..1..0..0....1..1..0..1..1....1..1..1..1..0
%e ..0..1..0..0..0....1..0..0..1..1....1..0..0..0..0....0..0..1..0..0
%e ..1..0..1..0..1....0..1..1..1..0....1..0..1..0..1....0..0..1..0..0
%e ..1..0..1..0..1....1..0..0..0..1....1..1..1..0..1....1..1..1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 15 2012