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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.
1
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
1,1
COMMENTS
Row 2 of A190071.
LINKS
EXAMPLE
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
CROSSREFS
Cf. A190071.
Sequence in context: A307182 A374906 A357061 * A063810 A183931 A320967
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved