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Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order
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%I #5 Mar 31 2012 12:37:11

%S 15,1369,1198601,6554439373,200108001096137,33391295169652273181

%N Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order

%C Diagonal of A206383

%e Some solutions for n=4

%e ..0..0..0..1..0....0..0..0..0..1....0..1..0..1..0....0..0..0..0..0

%e ..0..2..0..0..2....1..2..2..2..3....0..0..2..0..0....1..0..1..0..2

%e ..3..0..0..1..0....1..3..1..0..3....3..0..0..1..0....3..1..1..1..0

%e ..3..3..0..0..2....0..2..1..0..2....1..3..0..0..0....1..0..1..0..0

%e ..1..3..3..0..0....3..3..3..3..1....0..1..3..0..2....3..1..1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 07 2012