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%I #5 Mar 31 2012 12:35:56
%S 43,17203,58656073,1764076701091,464796062784203293,
%T 1074317319424680321399811
%N 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically
%C Diagonal of A184153
%e Some solutions for 3X3 with a(1,1)=0
%e ..0..2..2....0..2..3....0..2..2....0..1..1....0..3..1....0..0..0....0..2..3
%e ..0..0..0....3..3..3....0..2..3....1..1..1....1..3..2....0..2..2....0..2..2
%e ..2..3..3....2..1..2....3..2..0....2..3..2....2..3..3....0..2..0....2..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 09 2011