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%I #4 Mar 31 2012 12:36:38
%S 1,3,5,9,15,39,45,129,149,243,369,1365,2061,5901,5951,7785,10519,
%T 42519,59473,213561,157559,278835,503513,1553481,1051639,2491707,
%U 2981747,6622209,10056593,34139241
%N Number of 0..2 arrays x(0..n-1) of n elements with zero n-1st difference
%C Column 2 of A200154
%e Some solutions for n=6
%e ..0....0....1....1....2....2....2....1....2....2....2....0....2....0....1....1
%e ..2....1....0....2....2....0....2....2....1....0....0....0....0....0....0....0
%e ..1....2....0....0....1....1....2....1....0....0....0....0....2....0....0....1
%e ..1....2....0....0....0....1....2....0....0....0....1....0....2....1....1....1
%e ..2....1....0....2....0....0....2....0....1....0....2....0....0....2....2....0
%e ..0....0....1....1....2....2....2....1....2....2....2....0....2....0....1....1
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 13 2011
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