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%I #3 Nov 18 2014 05:41:10
%S 8,60,104,652,2432,12820,61092,300616,1423966,6523576,28749998,
%T 122577404,509838050,2086581780,8455716678,34069235524
%N Number of length n+2 0..3 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero
%C Column 3 of A250320
%e Some solutions for n=6
%e ..0....0....0....0....1....3....0....0....2....2....2....2....1....0....3....1
%e ..1....1....2....2....0....2....3....1....3....1....3....0....2....0....0....3
%e ..1....1....3....0....3....0....3....0....2....3....3....0....0....2....0....3
%e ..0....3....1....2....2....1....3....0....2....3....1....1....0....2....0....0
%e ..2....3....0....1....2....3....3....1....1....3....1....0....1....2....2....2
%e ..0....2....3....3....3....3....1....3....3....1....1....0....3....0....2....2
%e ..1....1....3....1....3....0....0....2....3....2....1....1....1....2....2....0
%e ..2....0....3....3....2....1....1....3....0....3....2....1....2....2....1....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 18 2014
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