A189952 1/4 the number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero

2, 8, 15, 29, 39, 61, 75, 103, 124, 155, 176, 225, 250, 289, 325, 381, 413, 475, 512, 578, 626, 688, 730, 826, 877, 947, 1009, 1095, 1150, 1255, 1317, 1419, 1489, 1578, 1650, 1789, 1862, 1959, 2040, 2176, 2254, 2391, 2476, 2601, 2708, 2831, 2918, 3098, 3197

Offset

1,1

Comments

Row 2 of A189951

Links

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

Example

Some solutions with n=3
.-2....3....2....1...-2...-2...-3....1...-3...-3...-3...-3....2....1....3...-3
..2....3....1...-1...-1...-2...-3...-3...-3...-3....3....1...-2....1...-1...-1
.-2...-1...-1...-1...-1...-2....1....2....3...-3....3....1....2...-1...-1...-1

Crossrefs

Sequence in context: A318272 A244476 A292202 * A077598 A095298 A297734

Adjacent sequences: A189949 A189950 A189951 * A189953 A189954 A189955

Keyword

nonn

Author

R. H. Hardin May 02 2011

Status

approved