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A265632 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, diagonal and antidiagonal neighbors by a power of two. 1

%I

%S 1,64,2660,35328,5852058,962138367,498846580538,14960802865507,

%T 4130309844097522,268900326021822223,236947971476002244912,

%U 8961761176387874932701,1772674566449746258218428

%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, diagonal and antidiagonal neighbors by a power of two.

%C Column 3 of A265635.

%H R. H. Hardin, <a href="/A265632/b265632.txt">Table of n, a(n) for n = 1..128</a>

%e Some solutions for n=4

%e ..0..8..0....0..4..2....0..4..5....0..1..5....0..2..3....0..4..0....0..1..5

%e ..6..4..6....8..4..8....5..4..8....3..4..3....3..2..3....8..4..5....5..1..3

%e ..5..7..5....5..7..6....8..7..5....8..7..5....6..7..6....3..7..3....5..7..3

%e ..3..7.11....6..7.11....8..7.11....8..9.11...11.10.11....6..7.11....3..7.11

%Y Cf. A265635.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 11 2015

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Last modified May 16 07:56 EDT 2022. Contains 353693 sequences. (Running on oeis4.)