A200551 Number of -6..6 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

114, 1368, 15476, 178834, 2076774, 24378976, 288237528, 3427837106, 40950125796, 491063998130, 5907663402532, 71267752107030, 861806880210532, 10443265297671942, 126784115884242080, 1541722886174306634

Offset: 1

Author

R. H. Hardin Nov 19 2011

Keywords

• nonn

Comments

Column 6 of A200553

Examples

			Some solutions for n=3
.-4....2....0...-1...-4...-3...-1....4...-2...-2....0....4...-5...-6...-2....2
..3....1....3....3....5....0...-2...-2....0....2....2....3....4....3....3...-4
.-1...-1....1...-1...-5....0....6....3....5....4...-1...-4...-3...-4....0....0
..1....0...-5....1...-2...-1...-2....1...-5...-5...-6...-2....0....6....2....6
..1...-2....1...-2....6....4...-1...-6....2....1....5...-1....4....1...-3...-4
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..113