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 A265631 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, diagonal and antidiagonal neighbors by a power of two. 1

%I

%S 1,0,21,585,8463,294394,6639203,120126908,6260685646,196840463674,

%T 6508183174645,197814464077227,7365189521794194,230043726410889775,

%U 7646516518149412694,244311983316534271813,12925753804930923765113

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

%C Column 2 of A265635.

%H R. H. Hardin, <a href="/A265631/b265631.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

%e ..5..7....3..5....3..7....6..4....3..4....6..4....3..4....5..4....5..7....6..4

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

%Y Cf. A265635.

%K nonn

%O 1,3

%A _R. H. Hardin_, Dec 11 2015

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Last modified January 16 13:57 EST 2022. Contains 350376 sequences. (Running on oeis4.)