A199527 Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements

1, 10, 90, 860, 8470, 84852, 860854, 8815392, 90927530, 943302430, 9832131238, 102882332054, 1080105471952, 11371474312404, 120012768975248, 1269300095287288, 13449845528174042, 142756162602411602

Offset

1,2

Comments

Column 5 of A199530

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Sequence in context: A033136 A061206 A373758 * A137684 A097394 A172199

Adjacent sequences: A199524 A199525 A199526 * A199528 A199529 A199530

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved