A202003 Number of -5..5 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, 121, 111, 2467, 14365, 221433, 1519417, 14540551, 130169953, 1459090675, 13589734965, 144206621427, 1452277199421, 15257211367065, 154052512468551, 1608600212618455, 16545700784493591, 173783329255817551

Offset

1,2

Comments

Column 5 of A202006

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

Some solutions for n=5
..2...-3...-1....3...-4....1....2...-3....0...-2....5....0....0...-3....2...-3
..3...-5...-1....0....2...-5....2....4....1....3....2....3...-3...-1....1...-4
.-1....4....3....1....3....0...-3....0....2....5...-5....1....0...-4...-3....4
..1....4....0...-4....1....0...-5....0...-2...-4...-3...-3....0....2...-2...-1
..2...-1....2...-2...-2....1....3....4...-1...-4....3...-2....3....1....2....5
.-5...-1...-1....2....1....1....2...-1....0....1...-2...-3....0....2....1....2
.-2....2...-2....0...-1....2...-1...-4....0....1....0....4....0....3...-1...-3

Crossrefs

Sequence in context: A152144 A282344 A249627 * A109838 A014734 A137517

Adjacent sequences: A202000 A202001 A202002 * A202004 A202005 A202006

Keyword

nonn

Author

R. H. Hardin Dec 07 2011

Status

approved