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%I #5 Aug 12 2016 07:04:22
%S 1,0,1,22,525,26100,1916217,197069522,26421089461,4477779976928,
%T 934604232708721
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, northeast or northwest neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A266886.
%e Some solutions for n=6
%e ..0..0....0..0....0..2....0..5....0..4....0..5....0..5....0..3....0..3....0..2
%e ..4..4....5..2....5..2....5..2....4..3....4..2....4..5....2..3....2..2....2..5
%e ..2..2....5..4....1..4....2..4....1..3....1..0....3..1....2..0....4..1....1..1
%e ..1..5....3..3....1..0....0..1....5..0....4..5....0..1....5..5....1..3....4..4
%e ..5..1....1..2....5..4....3..4....5..2....3..3....4..3....1..4....0..5....3..0
%e ..3..3....1..4....3..3....3..1....2..1....2..1....2..2....4..1....5..4....3..5
%Y Cf. A266886.
%K nonn
%O 1,4
%A _R. H. Hardin_, Jan 05 2016
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