A190067 Number of arrangements of n+1 nonzero numbers x(i) in -5..5 with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero

20, 143, 1126, 9904, 88509, 834717, 7843113, 73725405, 697624797, 6644826507, 63556636483, 609902716100, 5871497904831, 56683948490522, 548487091412193, 5317814454716839, 51651465543152430, 502495332741155890

Offset

1,1

Comments

Column 5 of A190071

Links

R. H. Hardin, Table of n, a(n) for n = 1..137

Example

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

Crossrefs

Sequence in context: A293932 A071816 A263960 * A238021 A183959 A094171

Adjacent sequences: A190064 A190065 A190066 * A190068 A190069 A190070

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved