A199529 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements

1, 14, 168, 2212, 29750, 407946, 5662636, 79345982, 1119873360, 15897133212, 226731289148, 3246399497138, 46636478912912, 671855095655758, 9702557118121642, 140418234266554336, 2035998107250999870

Offset

1,2

Comments

Column 7 of A199530

Links

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

Example

Some solutions for n=5
..3...-6...-3....5...-1....1....0....4...-7...-6...-6...-6....4...-3...-3...-4
.-3....7....0...-5....2...-2...-1...-4....2....5....5...-3....1...-2...-2....4
.-3....3....7....2....5...-7....4...-3....7....6...-2....6...-4...-2....7....3
.-3...-5...-1...-5...-7....7....0...-1...-2...-3....0....4....2....5....5...-3
..6....1...-3....3....1....1...-3....4....0...-2....3...-1...-3....2...-7....0

Crossrefs

Sequence in context: A159738 A062148 A200164 * A098299 A341500 A254811

Adjacent sequences: A199526 A199527 A199528 * A199530 A199531 A199532

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved