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%I #5 Aug 12 2016 06:54:16
%S 1,2,5,15,67,457,5628,119908,4350527
%N Number of (n+1)Xn arrays containing n copies of 0..n+1-1 with every element equal to or 1 greater than any north or west neighbors modulo n and the upper left element equal to 0.
%C Subdiagonal 1 of A268115.
%e Some solutions for n=6
%e ..0..1..2..2..3..4....0..1..1..2..3..4....0..0..0..1..1..2....0..0..1..1..2..3
%e ..1..2..3..3..4..5....1..2..2..3..4..5....0..1..1..1..2..3....0..1..1..2..3..4
%e ..2..2..3..4..5..6....2..3..3..4..5..6....1..2..2..2..3..4....1..2..2..3..4..5
%e ..2..3..4..5..6..0....2..3..4..5..6..6....2..3..3..3..4..5....1..2..3..4..5..6
%e ..3..4..5..6..0..1....3..4..5..6..0..0....3..4..4..4..5..6....2..3..4..5..6..6
%e ..4..5..6..0..0..1....4..5..6..0..0..1....4..5..5..5..6..0....3..4..5..5..6..0
%e ..5..6..6..0..1..1....5..6..0..1..1..2....5..6..6..6..6..0....4..5..6..6..0..0
%Y Cf. A268115.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 26 2016
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