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A204626 Number of (n+1)X5 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 A204626 #7 Jul 24 2025 19:37:18
%S A204626 6144,933462,141832254,21550390395,3274427479938,497525810748759,
%T A204626 75595484720747496,11486192649538372653,1745244733464500021670,
%U A204626 265177441526573391694167,40291813604266663731304284
%N A204626 Number of (n+1)X5 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 A204626 Column 4 of A204630
%H A204626 R. H. Hardin, <a href="/A204626/b204626.txt">Table of n, a(n) for n = 1..210</a>
%F A204626 Empirical: a(n) = 165*a(n-1) -2025*a(n-2) +6241*a(n-3) -270*a(n-4) -17282*a(n-5) +5524*a(n-6) +11864*a(n-7) +1568*a(n-8)
%e A204626 Some solutions for n=3
%e A204626 ..0..0..0..1..2....0..0..0..0..0....0..1..0..2..1....0..0..0..0..1
%e A204626 ..0..1..2..0..2....1..0..1..1..2....1..1..2..1..1....0..1..0..2..1
%e A204626 ..2..0..2..2..1....2..2..1..2..2....2..1..1..1..0....0..0..2..1..0
%e A204626 ..1..2..1..2..1....2..1..0..1..1....1..0..2..1..2....0..2..1..0..2
%K A204626 nonn
%O A204626 1,1
%A A204626 _R. H. Hardin_ Jan 17 2012