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%I #4 Dec 10 2015 12:34:18
%S 1,64,5625,545952,147336019,54825790582,25237215601657,
%T 5398176185968548,2317847898908866544,635566504276200616510,
%U 305266363265075079477151,143131715470675197060853750,73823000812542741031803846419
%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 diagonal neighbors by a power of two.
%C Column 3 of A265619.
%H R. H. Hardin, <a href="/A265616/b265616.txt">Table of n, a(n) for n = 1..102</a>
%e Some solutions for n=3
%e ..0..4..3....0..4..6....0..4..3....0..4..8....0..4..3....0..4..2....0..2..0
%e ..8..4..0....3..4..3....2..4..0....6..4..3....8..4..6....5..4..2....5..4..0
%e ..8..6..8....5..7..8....6..4..8....3..7..8....3..4..8....2..6..8....8..6..8
%Y Cf. A265619.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 10 2015
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