A184058 Number of strings of n+2 numbers x(i) in -6..6 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, 31, 207, 1531, 21411, 251231, 2880959, 33207359

Offset

1,2

Comments

Column 6 of A184061

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
.-2...-1...-3...-5....5...-2....1....5....5....0...-2...-4....4....0....2....4
..0....0...-2...-5....5....2...-2....2...-2....0...-4....3...-3....5....0...-6
..0....0....4....5...-5...-5....0....6...-2....4....4....2...-2....2....0....4
..2....1....0....0....0....0...-2...-4...-2....0....2....2...-1...-5....0....4
..4....2....2....5...-5....6...-1...-3....2....0...-4....2....3....1...-2...-2
.-4...-2...-1....0....0...-1....4...-6...-1...-4....4...-5...-1...-3....0...-4

Crossrefs

Sequence in context: A125341 A126499 A297758 * A096906 A181124 A142328

Adjacent sequences: A184055 A184056 A184057 * A184059 A184060 A184061

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved