%I #4 Mar 31 2012 12:37:23
%S 15,4140,4150760,10318694804,50996571454200,440379403449903222,
%T 6092197983646590702604
%N Number of 4Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors
%C Row 4 of A208466
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..1..2..0....0..1..0..2....1..2..0..0....1..0..1..1....0..1..0..0
%e ..0..0..0..0....1..0..0..0....0..0..1..0....0..1..2..0....0..0..1..0
%e ..1..0..1..2....0..1..0..2....0..0..0..0....0..0..0..0....0..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 27 2012
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