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%I #5 Aug 12 2016 07:04:21
%S 0,0,0,8,544,20976,3124800,269723136,61919980032,9210279970560,
%T 2897383466019840
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal, vertical, diagonal or antidiagonal neighbor equal to n-1.
%C Column 2 of A266208.
%e Some solutions for n=6
%e ..0..2....2..0....2..1....0..2....2..1....2..4....5..3....5..4....1..2....3..0
%e ..1..1....2..4....0..0....0..1....2..0....0..2....4..3....3..5....0..0....4..4
%e ..3..0....0..4....4..4....1..3....4..4....4..0....4..0....3..1....4..2....2..5
%e ..3..4....3..3....3..3....3..5....5..5....3..3....2..0....0..1....5..4....2..5
%e ..4..5....5..5....5..5....4..5....3..1....5..1....2..1....0..2....3..3....1..1
%e ..2..5....1..1....2..1....2..4....0..3....1..5....5..1....2..4....5..1....0..3
%Y Cf. A266208.
%K nonn
%O 1,4
%A _R. H. Hardin_, Dec 23 2015
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