A200459 Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero first and second differences.

14, 1582, 19802, 115140, 451708, 1375006, 3513884, 7910100, 16176994, 30639164, 54582252, 92444962, 150029642, 234839570, 356372880, 526276044, 758938962, 1071722528, 1485196016, 2023848468, 2716453852, 3596089776, 4701336350

Offset: 1

Author

R. H. Hardin Nov 18 2011

Keywords

• nonn

Comments

Row 5 of A200454

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..96