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%I #5 Mar 31 2012 12:36:58
%S 1296,27216,571536,12002256,252047376,5292994896,111152892816,
%T 2334210749136,49018425731856,1029386940368976,21617125747748496,
%U 453959640702718416,9533152454757086736,200196201549898821456
%N Number of (n+1)X3 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements
%C Column 2 of A203826
%H R. H. Hardin, <a href="/A203820/b203820.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 1296*21^(n-1)
%e Some solutions for n=4
%e ..1..0..1....3..1..3....2..1..1....1..0..0....0..2..0....3..0..1....2..0..1
%e ..2..2..1....2..0..3....2..3..2....1..3..1....3..1..0....1..2..1....1..3..1
%e ..0..0..1....1..1..1....0..0..0....2..2..0....2..1..2....1..2..3....0..2..1
%e ..1..2..1....3..2..3....2..1..3....1..3..1....0..3..2....3..0..3....1..2..3
%e ..1..0..0....0..1..1....2..0..2....0..2..1....0..1..0....1..1..3....0..2..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2012
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