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A202005
Number of -7..7 circular arrays x(0..n+1) of n+2 elements with zero sums of x(i) and x(i)*x((i+1) mod (n+2))
1
1, 225, 261, 6385, 53775, 1039409, 9882793, 128920651, 1579308193, 23513859009, 303320902795, 4356698829589, 59850896747721, 854686297958577, 11808876299989135, 167671189467252877, 2356186672203802947
OFFSET
1,2
COMMENTS
Column 7 of A202006
LINKS
EXAMPLE
Some solutions for n=4
.-1....3....6....4....4...-5....2...-2...-6....5...-1...-1....3....3...-5....0
.-1...-1....3....1...-7...-4....6....5...-4....7...-2....4...-4...-6....7....1
.-2....1....4...-4...-2....3...-7....2....6...-5...-2....2...-2...-5....2...-1
.-7...-2...-7...-5...-6...-1...-4...-3....0....0....1...-3....1....5....1...-1
..6...-3...-2....4....7....5...-4...-2....6...-5....6....0....0....4...-2....0
..5....2...-4....0....4....2....7....0...-2...-2...-2...-2....2...-1...-3....1
CROSSREFS
Sequence in context: A345552 A345806 A044871 * A359598 A207639 A077347
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 07 2011
STATUS
approved