%I #4 Mar 09 2013 07:57:48
%S 15,75,767,7794,101398,1346067,21064292,356150811,6366063573,
%T 115668702638,2139261596454,39572902785373,737955955427551,
%U 13730713590038976,256798310856319397,4793531311138014167
%N Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
%C Row 4 of A222906
%H R. H. Hardin, <a href="/A222909/b222909.txt">Table of n, a(n) for n = 1..31</a>
%e Some solutions for n=3
%e ..0..1..1....0..1..1....0..1..1....0..0..0....0..0..0....0..0..0....0..1..2
%e ..1..1..1....1..1..2....1..1..1....0..0..1....0..0..0....0..0..1....1..1..1
%e ..1..1..1....0..1..1....1..1..1....2..3..3....1..0..0....2..2..0....1..1..1
%e ..2..1..1....1..1..1....2..2..2....2..3..3....0..0..2....2..2..2....1..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2013