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A265620 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 diagonal neighbors by a power of two. 1

%I

%S 1,0,64,908,29296,538517,10912865,202080075,11808714880,409351818615,

%T 15022337089473,422671294158187,16797595808657585,525856235658025845,

%U 17318652008137477581,541691832239493218144,30028029442866868463331

%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 diagonal neighbors by a power of two.

%C Row 2 of A265619.

%H R. H. Hardin, <a href="/A265620/b265620.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..1..3..5....0..2..6..2....0..4..3..1....0..1..5..1....0..4..5..4

%e ..3..1..5..7....3..4..3..7....0..2..6..7....5..1..3..7....0..1..3..7

%Y Cf. A265619.

%K nonn

%O 1,3

%A _R. H. Hardin_, Dec 10 2015

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Last modified November 29 03:54 EST 2021. Contains 349416 sequences. (Running on oeis4.)