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%I #4 Dec 10 2015 07:54:26
%S 1,2,84,1354,38791,905458,22977880,517900514,22987752597,786599232404,
%T 29092136543507,913648420769831,35187548561281832,1167539263086885624,
%U 39956736928795429167,1306138963191078431958,64687399192829411688656
%N Number of 2Xn 0..2*n-1 arrays with upper left zero and lower right 2*n-1 and each element differing from its horizontal and antidiagonal neighbors by a power of two.
%C Row 2 of A265590.
%H R. H. Hardin, <a href="/A265591/b265591.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..2..6..7....0..1..5..4....0..2..6..7....0..2..6..7....0..1..5..3
%e ..6..2..6..7....3..1..5..7....3..4..6..7....0..4..5..7....5..4..5..7
%Y Cf. A265590.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 10 2015
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