%I #5 Jan 16 2022 00:19:05

%S 18,200,1648,13732,106362,744564,4808120,29723864,180290280,

%T 1085927844,6524507992,39167586296,235053968050,1410450413584,

%U 8463032114236,50779132943420

%N Number of length n+2 0..5 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.

%C Column 5 of A250561.

%e Some solutions for n=5

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

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

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

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

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

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

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

%Y Cf. A250561.

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 25 2014