A199939 Number of -4..4 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero

8, 56, 376, 2474, 16114, 104268, 672866, 4334232, 27893374, 179433990, 1154022716, 7420994944, 47717937374

Offset

1,1

Comments

Column 4 of A199943

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A162754 A081626 A272763 * A003494 A057084 A101596

Adjacent sequences: A199936 A199937 A199938 * A199940 A199941 A199942

Keyword

nonn

Author

R. H. Hardin Nov 12 2011

Status

approved