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%I #3 Dec 27 2014 09:35:12
%S 22,1968,4083,98124,570578,7036012,54817908,503679532,4023378619,
%T 33615995160,268926369666,2182138427066,17455223471532,140332925179614
%N Number of length n+2 0..7 arrays with the sum of medians of adjacent triples multiplied by some arrangement of +-1 equal to zero
%C Column 7 of A253129
%e Some solutions for n=4
%e ..3....0....4....0....6....0....5....5....5....6....4....1....7....3....5....6
%e ..7....5....1....7....0....7....7....0....1....2....4....1....3....0....6....2
%e ..6....7....0....3....3....6....6....7....1....6....4....0....1....2....7....2
%e ..5....4....1....3....7....6....3....5....0....3....0....3....7....5....6....2
%e ..5....1....1....6....6....2....6....2....0....7....2....5....5....4....2....3
%e ..2....6....4....2....0....6....7....7....2....2....5....7....1....1....7....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 27 2014