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Number of -7..7 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero
0

%I #4 Mar 31 2012 12:36:37

%S 0,14,114,1330,14156,169170,1882238,22017152,254776338

%N Number of -7..7 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero

%C Column 7 of A200038

%e Some solutions for n=6

%e ..3...-7...-7...-3....4...-4...-4...-3....1...-7...-5...-3....3....4...-7....1

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

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

%e ..5...-2....3...-5...-3....2....4...-4...-6....4...-4....2...-2....2...-6....4

%e ..6....5....5...-1....2....5....5...-1...-1...-4....4....1....1...-6....6...-7

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 12 2011