A189546 Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero

4, 8, 28, 72, 152, 264, 432, 660, 968, 1352, 1832, 2400, 3084, 3880, 4808, 5876, 7100, 8472, 10020, 11736, 13648, 15748, 18064, 20576, 23328, 26304, 29536, 33012, 36764, 40768, 45068, 49656, 54556, 59756, 65292, 71148, 77360, 83908, 90828, 98100

Offset

1,1

Comments

Row 2 of A189545

Links

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

Example

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

Crossrefs

Sequence in context: A306448 A090083 A034515 * A059480 A105723 A280118

Adjacent sequences: A189543 A189544 A189545 * A189547 A189548 A189549

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved