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%I #5 Mar 31 2012 12:36:39
%S 34,18692,548204,5876818,36725772,163058296,572857272,1697721154,
%T 4418429664,10383073842,22471124198,45437973772,86792210440,
%U 157952348940,275717978586,464147942094,756885155284,1199972729134,1855294240358
%N Number of -n..n arrays x(0..8) of 9 elements with zero sum and nonzero first and second differences
%C Row 7 of A200454
%H R. H. Hardin, <a href="/A200461/b200461.txt">Table of n, a(n) for n = 1..39</a>
%e Some solutions for n=3
%e ..1...-3...-3...-3....0...-3...-3....1....0....1....0....0...-3...-3...-3....0
%e .-3...-1....0...-1....1....1....0....0...-3....0...-3...-3....1....1....1...-3
%e ..1....3...-1...-2...-3...-2....1...-3....2....2....2....2...-3....2....2....1
%e .-3...-1....3....3....2....1...-3...-2....1...-2...-2...-3....0....0....0....3
%e ..2....1....0...-2....0....3....1....3....2...-1...-3....1...-1....2...-3...-3
%e ..3....0....2...-1...-3....2....3....2...-1....1....3...-3....2....3...-2....2
%e .-1....2....3....3....1...-1....0...-3...-2...-1....2....1....3....0....3...-2
%e .-2....1...-3....0....2...-2...-1....3...-1....1....3....3....1...-2....2...-1
%e ..2...-2...-1....3....0....1....2...-1....2...-1...-2....2....0...-3....0....3
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 18 2011
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