A199845 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.

1, 7, 32, 149, 630, 2600, 10426, 41079, 159330, 611698, 2329458, 8818874, 33234990, 124835120, 467743203, 1749482957, 6535398559, 24393753898, 91006458115, 339442473410, 1266045976128, 4722720042212, 17621749081077, 65775214030886

Offset: 1

Author

R. H. Hardin Nov 11 2011

Keywords

• nonn

Comments

Column 6 of A199847

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..165