Random triples
| Subject | Object |
|---|---|
| gptkb:OEIS:A000124 | a(n) is the number of regions formed when n+1 lines are drawn in the plane so that no two are parallel and no three are concurrent. |
| gptkb:OEIS:A000124 | Also called the central polygonal numbers. |
| Subject | Object |
|---|---|
| gptkb:OEIS:A000124 | a(n) is the number of regions formed when n+1 lines are drawn in the plane so that no two are parallel and no three are concurrent. |
| gptkb:OEIS:A000124 | Also called the central polygonal numbers. |