A189490 Number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.

0, 12, 152, 3388, 85480, 2642358, 93830584, 3870426602, 179336321514, 9289851475820, 529329739784248, 33294638055400354, 2251636269472534394, 165280305640591105462, 13029806159083867494110, 1097830097296833990293942

Offset: 1

Author

R. H. Hardin Apr 23 2011

Keywords

• nonn

Comments

Diagonal of A189498

Examples

			Some solutions for n=5
..5...-4...-3....4...-1...-5...-2....1....4...-2....3...-4...-2...-1...-1....2
..3....5...-4....1....2....2...-3...-1...-1....4....3....4...-1...-4....2...-4
..4....3...-2....3....2....3....2...-3...-1....4....4....4...-5....4....1...-2
.-2...-3....3...-1....4....1...-3....5...-4....2...-4...-4...-5....2....1...-3
.-1...-2....4...-3...-5...-2...-1...-4...-1...-2....5...-4...-4...-2...-5...-4
..4...-4...-4....3...-4...-2...-5...-1....4....2....4...-5....1...-5....5....5
		

Links

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