%I #5 Mar 31 2012 12:36:58
%S 487,23815,1166887,57177415,2801693287,137282971015,6726865579687,
%T 329616413404615,16151204256826087,791409008584478215,
%U 38779041420639432487,1900173029611332191815,93108478450955277398887
%N Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order
%C Column 3 of A203878
%H R. H. Hardin, <a href="/A203873/b203873.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 486*49^(n-1) +1
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..1..0..0....0..1..2..3....0..1..1..0
%e ..1..1..2..1....1..1..2..1....2..2..3..2....2..3..2..1....0..2..2..2
%e ..2..3..0..0....0..3..2..3....1..1..0..0....1..3..0..3....3..3..1..1
%e ..1..3..2..2....0..1..0..0....3..2..2..3....1..3..1..3....0..0..2..3
%e ..0..3..1..1....2..1..2..1....3..1..1..3....0..2..1..2....3..1..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 07 2012