%I #8 Oct 03 2025 08:23:27

%S 14,182,2294,28490,351148,4310382,52799912,646091920,7901341926

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

%C Column 7 of A199943

%e Some solutions for n=6

%e .-7...-7....1....1...-7...-7...-7...-7...-7....1...-7...-7...-7...-7....1...-7

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 12 2011