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%I #5 Mar 31 2012 12:37:23
%S 2,15,198,4041,113458,4132120,187612143,10318694804,672619407731,
%T 51074630353994,4455159144290726,441285917587055633,
%U 49152543937083199076,6105599904286957450405,839738743273230043872218
%N Number of 2Xn 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 2 of A208466
%H R. H. Hardin, <a href="/A208467/b208467.txt">Table of n, a(n) for n = 1..34</a>
%e Some solutions for n=4
%e ..0..0..1..0....0..1..1..0....0..0..1..0....0..0..0..0....0..0..0..0
%e ..0..1..0..0....0..0..0..1....0..0..2..0....1..1..2..0....0..1..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 27 2012
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