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A184059
Number of strings of n+2 numbers x(i) in -7..7 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
0
1, 33, 245, 2145, 35451, 496519
OFFSET
1,2
COMMENTS
Column 7 of A184061
EXAMPLE
Some solutions for n=4
.-7...-2....5....0....7....0....7....1....4....3....4....4....3....3...-4...-1
..5....5....0...-1...-2...-4...-2....0...-1...-2....4....6....0...-4....3...-1
.-3...-2...-4....2...-4....0....0....0...-4...-3...-4...-6....4...-1...-4....3
.-4...-3...-1....0...-1....0...-5....2...-1....3....0....2...-6....3...-2....2
..3...-3...-4...-1...-4....4...-6....3...-3...-1...-4....0...-3...-1....4...-5
..6....5....4....0....4....0....6...-6....5....0....0...-6....2....0....3....2
CROSSREFS
Sequence in context: A271208 A343499 A318744 * A197347 A344524 A197398
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2011
STATUS
approved