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%I #5 Mar 31 2012 17:15:16
%S 15,795,150501,101638401,244923340737,2105900715375957,
%T 64607710656824916891,7072434599436128908889787,
%U 2762433091820721094887987355053,3849929838909014980590084143791140141
%N 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or three distinct values
%e Some solutions for n=3
%e ..0..0..2..0....0..2..3..1....2..0..3..3....0..0..2..2....2..0..0..2
%e ..0..2..0..3....2..2..2..3....0..2..2..3....0..1..2..3....0..0..3..0
%e ..2..0..3..1....3..2..1..1....3..2..3..3....2..2..1..3....0..3..1..3
%e ..0..3..1..0....1..3..1..2....3..3..3..0....2..3..3..3....2..0..3..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 31 2012
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