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A184054
Number of strings of n+2 numbers x(i) in -2..2 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other
1
1, 9, 31, 107, 501, 2339, 10303, 44523, 198695, 888601, 3941855, 18017983, 83483541, 389450325, 1838319253, 8707491533, 41316656737, 196349474191, 934444664373, 4453775875859, 21254863852755, 101613183769703, 486794625431383
OFFSET
1,2
COMMENTS
Column 2 of A184061
LINKS
EXAMPLE
Some solutions for n=4
..2...-2....0....2...-2....0....0...-1....2...-1...-1...-1...-2....2....1....2
.-2....1....1....0....0...-2...-2....0....1....0....0....2....0....0....1...-1
.-1....0....0....0...-2...-2....0....0...-2....0....0....0....0....2...-1....1
..0....2...-2...-2....2....2...-2...-2....1....1....0...-1....0...-2....0....1
..0....1....1....0....2....0....2....2...-1....2....0...-2....2...-2....1...-2
..1...-2....0....0....0....2....2....1...-1...-2....1....2....0....0...-2...-1
CROSSREFS
Sequence in context: A321598 A048374 A226274 * A140323 A160653 A189436
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2011
STATUS
approved