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%I #4 Mar 31 2012 12:37:34
%S 3,33,798,39272,3683671,640787121,204615573204,119576103350570,
%T 127795340782521808,249802991080797461268
%N Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in lower triangle row major order
%e Some solutions for n=3
%e ..0..1..1..3....0..1..2..2....0..0..1..1....0..1..0..2....0..1..2..1
%e ..1..1..2..0....1..1..1..1....0..1..1..2....1..0..1..3....1..0..3..0
%e ..1..2..2..0....2..1..0..1....1..1..2..1....0..1..1..3....2..3..0..3
%e ..3..0..0..2....2..1..1..1....1..2..1..1....2..3..3..3....1..0..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 27 2012
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