A190076 Number of arrangements of 7 nonzero numbers x(i) in -n..n 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

40, 1896, 28656, 191456, 834717, 2783714, 7737762, 18951546, 41786130, 84902980, 162378720, 292892946, 503182507, 835582280, 1339061119, 2077237619, 3144963614, 4653920446, 6746522401, 9597835033, 13398597773, 18439060711

Offset

1,1

Comments

Row 6 of A190071

Links

R. H. Hardin, Table of n, a(n) for n = 1..126

Example

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

Crossrefs

Sequence in context: A143314 A308836 A189503 * A278729 A189550 A300116

Adjacent sequences: A190073 A190074 A190075 * A190077 A190078 A190079

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved