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%I #5 Jul 23 2025 12:16:20
%S 7,67,207,1991,14003,130335,1154141,10172515,86975297,715749943,
%T 5655832367,43083514447,318775210489,2309920909887
%N Number of length n+1 0..6 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero.
%C Column 6 of A250277
%e Some solutions for n=6
%e ..2....1....2....2....2....4....4....4....3....6....2....4....2....4....6....0
%e ..4....2....3....4....3....1....0....3....1....1....4....2....2....4....3....2
%e ..0....0....0....6....6....4....6....6....6....6....1....3....1....4....2....5
%e ..4....2....0....1....5....6....2....4....4....3....0....5....5....1....6....4
%e ..3....3....2....4....5....3....5....2....4....5....1....0....4....5....1....1
%e ..0....0....4....5....2....5....4....3....5....6....0....6....1....0....5....2
%e ..2....3....0....0....6....2....6....4....1....4....2....4....6....0....4....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 16 2014