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A183937
Number of strings of n numbers x(i) in -2..2 with sums of x(i) and of x(i)*x(i+1) both zero
1
1, 1, 5, 15, 81, 237, 1015, 3891, 16171, 66237, 297003, 1304467, 5981617, 27407859, 126441771, 584452845, 2721978059, 12719931479, 59862174023, 282898499059, 1341705275365, 6380905008633, 30422523202843, 145340620435425
OFFSET
1,3
COMMENTS
Column 2 of A183944
LINKS
EXAMPLE
All solutions for n=4
..1....0...-1....1....0...-2....0....1....2....2...-1....0....0...-1...-2
..0...-1....0....2...-2....0....0....0....0....0....0....2....1...-2....0
..0....0....0...-2....0....0....0...-1....0...-2....1....0....0....2....2
.-1....1....1...-1....2....2....0....0...-2....0....0...-2...-1....1....0
CROSSREFS
Sequence in context: A220818 A064678 A088935 * A275971 A030487 A165470
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 08 2011
STATUS
approved