A189539 Number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of trunc(x(i)/x(i+1)) equal to zero

12, 28, 192, 964, 5416, 31280, 173792, 977092, 5562216, 31839976, 182830560, 1054020072, 6094150672, 35317631800, 205154575120, 1194077810020, 6961965310984, 40654382303400, 237732203953600, 1391919066252408

Offset

1,1

Comments

Column 3 of A189545

Links

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

Example

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

Crossrefs

Sequence in context: A351104 A340685 A203026 * A000546 A130516 A045554

Adjacent sequences: A189536 A189537 A189538 * A189540 A189541 A189542

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved