%I #4 Mar 31 2012 12:36:37
%S 0,6,14,84,264,1450,5268,25070,102854,460146,1954930,8681238,37537698,
%T 165783402,725328338,3201189116
%N Number of -3..3 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero
%C Column 3 of A200038
%e Some solutions for n=6
%e .-2...-2....3....2...-2...-1...-1...-3....2....3...-1...-2....3....2....1...-3
%e ..2...-1...-1...-1....3...-3...-3....3...-2...-2....3...-3...-1....1...-2....3
%e ..3....2....1...-3....2....3....2...-2....2....3...-2...-1...-2...-3....3....2
%e .-2...-3....2....2...-3....1....1....2...-3...-2....3....2....2....2...-2...-1
%e ..1....3...-2...-2....3...-3....2...-1...-2...-3...-1....3...-3...-3....2....2
%e .-2....1...-3....2...-3....3...-1....1....3....1...-2....1....1....1...-2...-3
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 12 2011