A199830 Number of -6..6 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.

102, 1144, 11384, 124982, 1402934, 15805218, 179213048, 2044221894, 23427591518, 269528370904, 3111004900884, 36009192415678, 417810425670462, 4858093196583212, 56593178356427376, 660363780853262084

Offset: 1

Author

R. H. Hardin Nov 11 2011

Keywords

• nonn

Comments

Column 6 of A199832

Examples

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

Links

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