A184057 Number of strings of n+2 numbers x(i) in -5..5 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, 25, 143, 839, 10135, 106047, 1015445, 9974135, 100003019, 1002241579, 9943531087

Offset

1,2

Comments

Column 5 of A184061

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A147505 A147360 A147223 * A235713 A072471 A017042

Adjacent sequences: A184054 A184055 A184056 * A184058 A184059 A184060

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved