A199527 Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.

1, 10, 90, 860, 8470, 84852, 860854, 8815392, 90927530, 943302430, 9832131238, 102882332054, 1080105471952, 11371474312404, 120012768975248, 1269300095287288, 13449845528174042, 142756162602411602

Offset: 1

Author

R. H. Hardin Nov 07 2011

Keywords

• nonn

Comments

Column 5 of A199530

Examples

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

Links

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