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%I #3 Nov 25 2014 09:26:49
%S 25,321,3125,31173,290909,2457921,18934449,137976845,980389815,
%T 6899647449,48392977271,339018816865,2373951608191,16620410187793,
%U 116352541474531
%N Number of length n+2 0..6 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero
%C Column 6 of A250561
%e Some solutions for n=4
%e ..6....5....0....5....6....6....2....3....4....3....4....6....2....6....1....4
%e ..0....6....2....1....4....4....3....1....2....2....6....4....3....4....3....4
%e ..0....6....6....4....0....6....5....1....3....1....0....3....3....1....4....5
%e ..4....1....4....1....0....5....3....4....0....1....6....5....4....1....0....2
%e ..3....1....6....1....4....1....6....6....4....5....1....2....2....6....4....4
%e ..5....2....4....3....6....1....1....4....2....6....3....6....5....4....6....6
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 25 2014
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