%I
%S 1,3,3,3,5,5,5,7,3,3,7,9,11,17,5,3,13,17,15,21,5,9,21,19,9,13,3,5,21,
%T 17
%N Number of 0..2 arrays x(0..n+1) of n+2 elements with zero n1st differences
%C Column 2 of A200272
%e All solutions for n=6
%e ..1....1....0....1....2
%e ..0....2....0....1....2
%e ..1....1....0....1....2
%e ..2....0....0....1....2
%e ..2....0....0....1....2
%e ..1....1....0....1....2
%e ..0....2....0....1....2
%e ..1....1....0....1....2
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 15 2011
