A200550 Number of -5..5 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

80, 836, 7778, 75792, 737460, 7286542, 72366820, 723237026, 7258296910, 73127883596, 739101010202, 7490787201124, 76099633989974, 774719436417776, 7901415122713726, 80719023935569240, 825814487838111514

Offset: 1

Author

R. H. Hardin Nov 19 2011

Keywords

• nonn

Comments

Column 5 of A200553

Examples

			Some solutions for n=3
..3....5....3....1...-3....2...-5...-1....0...-5...-4...-3...-5....0...-5....3
.-1....0...-2...-3....3...-4....5....5...-5...-3....3....2...-2...-3....1...-2
..0...-2....1....5...-1....1...-4...-3....4....1....0...-5....2....3....4....3
.-3...-2....0....2....2....1....3....3....4....3...-1....1....2....2...-2...-3
..1...-1...-2...-5...-1....0....1...-4...-3....4....2....5....3...-2....2...-1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..145