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%I #5 Aug 12 2016 07:04:21
%S 1,0,1,4,187,7400,573865,58849205,8029423880,1380758051751,
%T 292145368826808
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west, northwest or northeast neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A266493.
%e Some solutions for n=5
%e ..0..0....0..0....0..3....0..3....0..4....0..0....0..2....0..4....0..4....0..0
%e ..4..2....2..2....2..0....0..3....4..3....4..3....0..4....3..3....4..3....2..2
%e ..2..1....4..1....4..2....2..2....1..1....3..2....3..3....2..0....1..1....1..4
%e ..1..4....4..3....1..4....4..1....3..0....2..1....2..1....2..4....0..3....4..1
%e ..3..3....1..3....1..3....1..4....2..2....4..1....4..1....1..1....2..2....3..3
%Y Cf. A266493.
%K nonn
%O 1,4
%A _R. H. Hardin_, Dec 30 2015
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