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%I #5 Aug 12 2016 07:04:21
%S 1,0,1,11,314,16904,1344296,145081212,20235221346,3536250581320,
%T 756433785656967
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west or northwest neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A266832.
%e Some solutions for n=5
%e ..0..0....0..4....0..4....0..4....0..3....0..3....0..0....0..2....0..2....0..0
%e ..3..2....2..2....4..2....3..3....0..2....0..2....3..2....2..4....4..2....4..4
%e ..2..1....1..0....3..2....1..1....4..4....2..4....2..1....1..1....4..1....3..3
%e ..4..4....1..3....1..1....0..4....3..1....1..4....4..4....0..3....3..1....2..1
%e ..1..3....4..3....3..0....2..2....2..1....1..3....3..1....4..3....0..3....2..1
%Y Cf. A266832.
%K nonn
%O 1,4
%A _R. H. Hardin_, Jan 04 2016
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