A190063 Number of arrangements of n+1 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.

0, 12, 166, 3481, 88509, 2783714, 101530262, 4232955454, 198636188057, 10408538943146, 603033909983829, 38103929980500423, 2608648993698684772, 193359775333060165517, 15364574547397697984616, 1301880431718317296701496

Offset: 1

Author

R. H. Hardin May 04 2011

Keywords

• nonn

Comments

Diagonal of A190071

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21