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%I #4 Mar 31 2012 12:36:12
%S 33,561,2161,34625,283893,4409889,55520361,870473329,12869671489,
%T 204942934341,3212586862645
%N Number of arrangements of n+1 numbers x(i) in -8..8 with the sum of x(i)*x(i+1) equal to zero
%C Column 8 of A188358
%e Some solutions for n=4
%e .-7....6...-2...-3....4...-7...-5....0....0....0...-4...-7....8....1...-5....3
%e .-1....5....0....8....3....0....0...-6....0...-4...-2...-7...-6...-8....0....3
%e ..7...-6...-7....3....0...-3...-6...-4...-3....3....4....5....0....1...-7...-5
%e .-2....4...-5...-7....4....0....4....3...-7...-4....0...-7....6...-8....5...-3
%e .-7....6....7...-3...-3...-2....6...-4....3...-6...-3...-3....8...-3....7....3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 28 2011
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