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%I #4 Dec 03 2015 12:18:17
%S 2,139,170970,36765048,19256175024,7187180809683,2362949716450873,
%T 843066901320090228,786229883043780152659,493493320537858294879619,
%U 294732734608666165262289214,146109268578429647861705542348
%N Number of nX4 0..n*4-1 arrays with upper left zero and lower right n*4-1 and each element differing from its horizontal and vertical neighbors by a power of two.
%C Column 4 of A265178.
%H R. H. Hardin, <a href="/A265176/b265176.txt">Table of n, a(n) for n = 1..45</a>
%e Some solutions for n=3
%e ..0..8..9..5....0..2..4..5....0..4..3..2....0..1..9.11....0..8..9..5
%e ..1..0..8..9....1..3..5..3....1..3.11.10....4..3..1..3....2..6..5..7
%e ..9..1..9.11....3..2..3.11....3..2..3.11....3..1..9.11....6.10..9.11
%Y Cf. A265178.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 03 2015
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