A189499 Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

4, 12, 38, 78, 148, 240, 380, 554, 788, 1062, 1410, 1806, 2294, 2844, 3498, 4226, 5068, 5988, 7040, 8180, 9466, 10850, 12396, 14046, 15876, 17824, 19960, 22226, 24696, 27296, 30118, 33090, 36288, 39642, 43242, 47002, 51022, 55220, 59690, 64346, 69294

Offset

1,1

Comments

Row 2 of A189498

Links

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

Example

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

Crossrefs

Sequence in context: A149322 A149323 A024590 * A183159 A369682 A289809

Adjacent sequences: A189496 A189497 A189498 * A189500 A189501 A189502

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved