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%I #3 Nov 25 2014 09:30:30
%S 254,9611,127586,937817,4808120,18934449,62245658,176612641,448770968,
%T 1038399963,2233005894
%N Number of length 7+2 0..n arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero
%C Row 7 of A250561
%e Some solutions for n=3
%e ..0....2....0....3....0....3....0....2....2....1....1....2....3....0....2....3
%e ..3....0....2....2....1....0....0....2....0....1....1....2....1....3....0....2
%e ..2....3....2....0....3....2....3....2....0....0....0....2....2....2....2....2
%e ..3....3....2....1....1....3....2....2....0....0....1....1....1....1....0....3
%e ..0....3....1....3....0....3....3....3....1....2....2....0....2....2....1....1
%e ..2....3....3....3....0....2....0....2....2....3....1....1....3....3....3....2
%e ..2....3....2....3....0....2....1....1....3....0....0....2....1....1....2....0
%e ..2....1....0....0....3....0....2....3....0....1....1....3....2....1....2....1
%e ..1....3....0....1....0....3....0....3....2....1....3....1....0....0....2....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 25 2014
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