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

1,1

Comments

Column 6 of A199832

Links

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

Example

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

Crossrefs

Sequence in context: A371055 A088805 A206171 * A200452 A204859 A205425

Adjacent sequences: A199827 A199828 A199829 * A199831 A199832 A199833

Keyword

nonn

Author

R. H. Hardin Nov 11 2011

Status

approved