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%I
%S 1,1,17,69,1417,9335,135793,1639099,23586625,323498939,4919390397,
%T 73971159473,1157160667507
%N Number of strings of n numbers x(i) in -8..8 with sums of x(i) and of x(i)*x(i+1) both zero
%C Column 8 of A183944
%e Some solutions for n=4
%e ..3....6....3...-4....7...-2...-3...-8....0...-4....8....2....5...-2....0....0
%e ..0....0....6....0....0....0....0....2....7....1....0....0....0...-4....8...-3
%e ..0...-6...-6....0...-7....2....3....4....0....2...-8....0...-5...-2....0....0
%e .-3....0...-3....4....0....0....0....2...-7....1....0...-2....0....8...-8....3
%K nonn
%O 1,3
%A _R. H. Hardin_ Jan 08 2011
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