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%I #7 Oct 20 2022 23:03:24
%S 1,3,3,3,7,9,9,15,7,3,11,29,43,73,25,5,27,53,97,123,29,41,93,85,35,35,
%T 17,9,55,73
%N Number of 0..2 arrays x(0..n) of n+1 elements with zero n-1st differences.
%C Column 2 of A200082.
%e All solutions for n=6
%e ..1....0....2....1....2....1....0....2....0
%e ..1....1....1....2....0....0....2....2....0
%e ..1....2....0....1....0....1....2....2....0
%e ..1....2....0....0....1....2....1....2....0
%e ..1....1....1....0....2....2....0....2....0
%e ..1....0....2....1....2....1....0....2....0
%e ..1....1....1....2....0....0....2....2....0
%Y Cf. A200082.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 13 2011