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A199698
Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal
1
1, 4, 14, 52, 200, 708, 2642, 10000, 37984, 144876, 554120, 2128672, 8204180, 31697564, 122734614, 476170124, 1850664202, 7204005752, 28081918548, 109604285492, 428278469018, 1675246478864, 6559126501510, 25703606447364
OFFSET
1,2
COMMENTS
Column 2 of A199704
LINKS
EXAMPLE
Some solutions for n=5
..0....1...-2....0....2...-1....2....2....1....2...-1....2....1....0....2....0
.-1....0....2....1...-2....1....1....0...-1...-2....1...-1....2...-1...-1...-1
..1...-1...-1...-2....1...-1...-1...-1....0....0....0....1...-2....1....1....2
.-1...-2....0....0...-1....1...-2....1...-2...-1...-1....0...-1....2...-2...-1
..1....2....1....1....0....0....0...-2....2....1....1...-2....0...-2....0....0
CROSSREFS
Sequence in context: A017947 A244898 A244935 * A052710 A364410 A262594
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 09 2011
STATUS
approved