A199827 Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero

24, 140, 646, 3556, 20240, 113884, 645780, 3685550, 21117750, 121503530, 701432670, 4060132070, 23557575574, 136975281374, 797920002262, 4655761528566, 27205829211568, 159187551327960, 932560727269722

Offset

1,1

Comments

Column 3 of A199832

Links

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

Example

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

Crossrefs

Sequence in context: A205343 A267631 A305681 * A223471 A219988 A316928

Adjacent sequences: A199824 A199825 A199826 * A199828 A199829 A199830

Keyword

nonn

Author

R. H. Hardin Nov 11 2011

Status

approved