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A204622 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.

%I A204622 #8 Jul 22 2025 18:10:25
%S A204622 12,2049,2490558,21550390395,1327448018292252,582081449451902347866,
%T A204622 1816995451072561641887723586,40376415985445663379679403072064855,
%U A204622 6387126785648912581213165822171077074078454
%N A204622 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 A204622 Diagonal of A204630
%H A204622 R. H. Hardin, <a href="/A204622/b204622.txt">Table of n, a(n) for n = 1..11</a>
%e A204622 Some solutions for n=3
%e A204622 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1....0..1..1..0
%e A204622 ..1..0..1..0....1..1..0..2....0..1..2..0....1..1..0..1....1..2..1..2
%e A204622 ..2..1..1..0....2..0..2..1....1..2..2..0....2..2..1..1....0..1..0..1
%e A204622 ..2..0..0..0....1..2..1..0....0..1..1..2....1..1..0..0....2..0..0..1
%K A204622 nonn
%O A204622 1,1
%A A204622 _R. H. Hardin_ Jan 17 2012