%I #5 Mar 31 2012 12:37:25
%S 715,5826959,40380275500,271499374919883,1820216057105650386,
%T 12201956787655438957014,81798476241280856702695038,
%U 548357000894509223687629476021,3676054154412185019451007694406065
%N Number of 7Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
%C Row 7 of A208872
%H R. H. Hardin, <a href="/A208878/b208878.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=4
%e ..0..0..0..0....0..1..0..0....0..0..0..1....0..0..0..1....0..0..0..0
%e ..1..2..1..1....1..0..1..2....1..1..0..0....1..1..2..1....1..1..1..1
%e ..1..0..2..1....1..2..0..0....0..1..2..1....2..1..0..3....0..2..3..3
%e ..3..3..1..2....3..1..3..0....3..1..3..0....2..3..0..0....3..2..0..0
%e ..0..2..3..1....1..0..1..3....0..1..0..2....0..2..1..3....3..0..2..0
%e ..2..0..0..1....2..3..1..3....0..1..0..2....2..0..1..0....2..3..3..0
%e ..0..2..2..0....2..2..1..1....0..1..1..1....2..0..1..2....0..0..3..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 02 2012