A199942 Number of -7..7 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero

14, 182, 2294, 28490, 351148, 4310382, 52799912, 646091920, 7901341926

Offset

1,1

Comments

Column 7 of A199943

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A133286 A163416 A162783 * A097828 A030008 A342883

Adjacent sequences: A199939 A199940 A199941 * A199943 A199944 A199945

Keyword

nonn

Author

R. H. Hardin Nov 12 2011

Status

approved