%I #6 Mar 31 2012 12:37:02

%S 12,2049,2490558,21550390395,1327448018292252,582081449451902347866,

%T 1816995451072561641887723586,40376415985445663379679403072064855,

%U 6387126785648912581213165822171077074078454

%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order

%C Diagonal of A204630

%H R. H. Hardin, <a href="/A204622/b204622.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 17 2012