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%I #5 Mar 31 2012 12:36:58
%S 55,1135,23815,500095,10501975,220541455,4631370535,97258781215,
%T 2042434405495,42891122515375,900713572822855,18914985029279935,
%U 397214685614878615,8341508397912450895,175171676356161468775
%N Number of (n+1)X3 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order
%C Column 2 of A203878
%H R. H. Hardin, <a href="/A203872/b203872.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 54*21^(n-1) +1
%e Some solutions for n=4
%e ..0..0..1....0..0..0....0..0..0....0..1..0....0..1..0....0..0..0....0..0..0
%e ..1..2..1....1..1..1....1..1..1....0..1..2....0..1..0....1..1..2....1..1..1
%e ..1..2..3....0..2..0....2..0..2....2..3..2....2..1..3....3..3..2....2..2..2
%e ..0..2..3....0..1..0....2..1..1....0..1..1....2..0..2....1..1..0....1..3..1
%e ..1..1..0....2..3..2....3..3..2....2..2..2....2..0..1....3..3..2....1..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 07 2012