A190074 Number of arrangements of 5 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

12, 144, 922, 3481, 9904, 23400, 48491, 92478, 162599, 270267, 430274, 655974, 965098, 1390174, 1947527, 2667906, 3590889, 4753865, 6198717, 7979654, 10128692, 12732119, 15867500, 19571053, 23904927, 29021539, 34967650, 41839570, 49768153

Offset

1,1

Comments

Row 4 of A190071

Links

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

Example

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

Crossrefs

Sequence in context: A188609 A206873 A188846 * A188853 A188503 A206879

Adjacent sequences: A190071 A190072 A190073 * A190075 A190076 A190077

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved