A189954 1/4 the number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero

8, 72, 384, 1246, 3247, 6733, 13034, 22220, 36293, 55724, 82485, 116630, 162360, 219198, 290165, 376419, 481243, 606253, 754108, 927521, 1130575, 1364106, 1631281, 1935163, 2280562, 2673957, 3110403, 3602734, 4147102, 4757233, 5423413

Offset

1,1

Comments

Row 4 of A189951

Links

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

Example

Some solutions with n=3
..1....1....2....1....1...-2....3....2....1....1....3....3....3...-3....2....3
.-2....2....1...-3....3....1...-3...-2...-3....1...-2....1....1...-3....2...-3
.-1...-1...-3...-1...-2....3....1...-2...-2...-3...-1...-2....1....3....2....1
.-2....3...-3...-2....3...-1...-1....1....1...-1...-3...-1...-1....3...-2...-3
.-2....1....2....2....1...-3....1....1...-1...-3....3...-3...-1...-3....2...-2

Crossrefs

Sequence in context: A254371 A143945 A239095 * A271028 A180288 A082141

Adjacent sequences: A189951 A189952 A189953 * A189955 A189956 A189957

Keyword

nonn

Author

R. H. Hardin May 02 2011

Status

approved