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A265174 Number of nX2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal and vertical neighbors by a power of two. 1

%I

%S 1,4,21,139,8463,219995,6639203,149441692,6260685646,183876714594,

%T 6508183174645,200502557111619,7365189521794194,232750786457812689,

%U 7646516518149412694,242109459701672908262,12925753804930923765113

%N Number of nX2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal and vertical neighbors by a power of two.

%C Column 2 of A265178.

%H R. H. Hardin, <a href="/A265174/b265174.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..4....0..2....0..1....0..2....0..1....0..4....0..2....0..1....0..4....0..1

%e ..1..5....2..6....1..5....2..3....4..5....1..2....2..4....4..5....4..5....4..2

%e ..2..6....6..5....2..3....4..5....5..6....5..6....4..6....2..3....5..3....5..3

%e ..3..7....5..7....3..7....3..7....3..7....3..7....6..7....3..7....6..7....6..7

%Y Cf. A265178.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 03 2015

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Last modified September 30 09:50 EDT 2022. Contains 357104 sequences. (Running on oeis4.)