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%I #4 Dec 03 2015 12:17:36
%S 1,21,2024,170970,7796840,1346956387,226158945148,16064538255326,
%T 2727481849960472,241831690436276658,46326258129266431511,
%U 5463137744818812207086,939106595874317262360608
%N Number of nX3 0..n*3-1 arrays with upper left zero and lower right n*3-1 and each element differing from its horizontal and vertical neighbors by a power of two.
%C Column 3 of A265178.
%H R. H. Hardin, <a href="/A265175/b265175.txt">Table of n, a(n) for n = 1..194</a>
%e Some solutions for n=4
%e ..0..2..3....0..1..0....0..4..3....0..8..6....0..2..6....0..4..5....0..1..2
%e ..2..3..7....1..3..1....8..6..5....8..6..2....2..3..5....8..6..4....4..5..1
%e ..4..5..9....3.11..3....9..5..7....4..8.10....6..7..3....9..7..3....3..7..3
%e ..2..3.11....2..3.11....8..7.11....5..9.11....7..3.11....8..9.11....2..3.11
%Y Cf. A265178.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 03 2015
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