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Number of length n+2 0..7 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero
0

%I #3 Nov 25 2014 09:27:09

%S 32,480,5446,63400,695890,6924692,62245658,522997696,4258085394,

%T 34261234132,274598186760,2198154605100,17589251301614,140726940443068

%N Number of length n+2 0..7 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero

%C Column 7 of A250561

%e Some solutions for n=4

%e ..1....5....5....0....4....2....3....6....6....3....2....6....6....3....7....7

%e ..5....4....2....5....3....1....0....2....5....6....4....4....1....2....7....4

%e ..1....3....0....7....3....0....6....4....3....0....5....4....7....5....2....2

%e ..1....6....2....1....0....4....4....1....2....2....0....0....5....0....1....0

%e ..1....7....0....5....2....5....6....4....3....3....3....6....4....1....2....5

%e ..5....2....5....4....5....4....3....2....2....4....7....4....1....0....0....4

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 25 2014