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%I #4 Mar 31 2012 12:37:23
%S 5,159,15215,2946848,960563033,474608323506,332296957718504,
%T 314368829216470278,387798647378880473938,606687187218093234631931
%N Number of 3Xn nonnegative integer arrays with new values 0 upwards 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 3 of A208581
%e Some solutions for n=4
%e ..0..0..0..0....0..0..1..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..1..1..1..0....1..0..1..0....1..1..1..0....1..1..2..0....1..2..1..1
%e ..0..0..1..0....0..1..0..1....0..0..2..1....0..0..2..0....0..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 29 2012
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