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

Author

R. H. Hardin May 04 2011

Keywords

• nonn

Comments

Row 6 of A190071

Examples

			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
		

Links

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