%I
%S 212,5849,61092,363457,1559080,5237161,14866258,37065983,83449226,
%T 172987415
%N Number of length 7+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +1 equal to zero
%C Row 7 of A250320
%e Some solutions for n=3
%e ..3....3....0....0....2....2....3....0....1....1....2....3....1....3....0....2
%e ..1....1....0....3....3....3....1....1....0....0....0....3....3....1....0....1
%e ..1....0....0....3....3....3....1....3....3....1....3....0....2....1....1....0
%e ..0....0....1....3....0....0....2....2....2....3....0....3....3....0....3....1
%e ..0....2....2....3....0....1....2....2....0....0....3....2....1....0....2....2
%e ..1....2....1....3....2....1....3....3....2....3....3....2....0....1....2....3
%e ..2....1....2....0....0....3....0....3....2....2....0....0....0....2....3....0
%e ..2....1....3....3....3....0....1....0....0....0....2....0....0....2....0....1
%e ..0....3....1....0....0....3....3....1....1....1....2....2....2....2....0....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 18 2014
