A199529 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.

1, 14, 168, 2212, 29750, 407946, 5662636, 79345982, 1119873360, 15897133212, 226731289148, 3246399497138, 46636478912912, 671855095655758, 9702557118121642, 140418234266554336, 2035998107250999870

Offset: 1

Author

R. H. Hardin Nov 07 2011

Keywords

• nonn

Comments

Column 7 of A199530

Examples

			Some solutions for n=5
..3...-6...-3....5...-1....1....0....4...-7...-6...-6...-6....4...-3...-3...-4
.-3....7....0...-5....2...-2...-1...-4....2....5....5...-3....1...-2...-2....4
.-3....3....7....2....5...-7....4...-3....7....6...-2....6...-4...-2....7....3
.-3...-5...-1...-5...-7....7....0...-1...-2...-3....0....4....2....5....5...-3
..6....1...-3....3....1....1...-3....4....0...-2....3...-1...-3....2...-7....0
		

Links

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