A200450 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

44, 342, 2334, 16380, 115140, 820650, 5876818, 42324384, 306098316, 2222013090, 16179361028, 118122171194, 864377954818, 6338065287424, 46557302873890, 342540516750538, 2523812868946712, 18619248362911724, 137522653687668252

Offset: 1

Author

R. H. Hardin Nov 18 2011

Keywords

• nonn

Comments

Column 4 of A200454

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200