A190072 Number of arrangements of 3 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.

4, 12, 36, 76, 143, 233, 366, 536, 760, 1028, 1363, 1751, 2221, 2758, 3387, 4096, 4907, 5804, 6819, 7931, 9174, 10525, 12021, 13631, 15401, 17299, 19366, 21572, 23959, 26490, 29220, 32114, 35210, 38476, 41963, 45629, 49527, 53618, 57953, 62489, 67285

Offset: 1

Author

R. H. Hardin, May 04 2011

Keywords

• nonn

Comments

Row 2 of A190071.

Examples

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

Links

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

Crossrefs

Cf. A190071.