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A266040 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any vertical or antidiagonal neighbor equal to n-1. 0

%I

%S 1,0,8,104,6440,312960,36965712,3615441408,668391093888,

%T 108118788084480,29018593889026560,7014015968947706880

%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any vertical or antidiagonal neighbor equal to n-1.

%C Column 2 of A266042.

%e Some solutions for n=4

%e ..2..2....3..0....0..0....3..3....3..2....1..2....2..2....3..2....2..0....3..3

%e ..3..0....1..1....2..1....1..1....3..0....3..0....0..0....2..0....2..1....2..1

%e ..1..1....3..0....3..3....0..0....1..0....2..1....1..1....0..1....0..3....0..0

%e ..0..3....2..2....2..1....2..2....1..2....0..3....3..3....1..3....1..3....1..2

%Y Cf. A266042.

%K nonn

%O 1,3

%A _R. H. Hardin_, Dec 20 2015

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Last modified January 19 09:16 EST 2022. Contains 350464 sequences. (Running on oeis4.)