%I #4 Mar 31 2012 12:37:34
%S 2,25,1479,258581,130785357,190865489427,803986116428812,
%T 9774577782495936824,342988668346099489744721,
%U 34737069299078187196492748928
%N Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in lower triangle row major order
%e Some solutions for n=3
%e ..0..0..1..3....0..1..3..2....0..1..2..1....0..1..2..2....0..1..3..0
%e ..0..0..2..2....1..2..0..3....1..2..0..3....1..2..0..3....1..2..3..1
%e ..1..2..1..3....3..0..1..0....2..0..1..1....2..0..3..1....3..3..0..0
%e ..3..2..3..0....2..3..0..3....1..3..1..1....2..3..1..2....0..1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 27 2012