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%I #8 Apr 14 2020 21:34:29
%S 1,3,6,15,55,279,2033,21772,345843,8152180,287657713
%N Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any north or northeast neighbors modulo n and the upper left element equal to 0.
%C Diagonal of A267553.
%e Some solutions for n=4
%e ..0..0..1..1....0..0..0..0....0..0..1..2....0..0..1..2....0..1..1..2
%e ..0..1..2..2....1..1..1..1....1..1..2..3....1..1..2..3....1..1..2..3
%e ..1..2..3..3....2..2..2..2....2..2..3..0....1..2..3..3....2..2..3..0
%e ..2..3..3..0....3..3..3..3....3..3..0..1....2..3..0..0....3..3..0..0
%Y Cf. A267553.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 17 2016
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