login
A199827
Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 11 2011
STATUS
approved