A061857 formatted as a triangular array:
| | | | | | | | | | | 0 | | | | | | | | | | | |
| | | | | | | | | | 1 | | 0 | | | | | | | | | | |
| | | | | | | | | 3 | | 1 | | 1 | | | | | | | | | |
| | | | | | | | 6 | | 2 | | 2 | | 1 | | | | | | | | |
| | | | | | | 10 | | 4 | | 4 | | 2 | | 2 | | | | | | | |
| | | | | | 15 | | 6 | | 5 | | 3 | | 3 | | 2 | | | | | | |
| | | | | 21 | | 9 | | 7 | | 5 | | 4 | | 3 | | 3 | | | | | |
| | | | 28 | | 12 | | 10 | | 6 | | 6 | | 4 | | 4 | | 3 | | | | |
| | | 36 | | 16 | | 12 | | 8 | | 8 | | 5 | | 5 | | 4 | | 4 | | | |
| | 45 | | 20 | | 15 | | 10 | | 9 | | 7 | | 6 | | 5 | | 5 | | 4 | | |
| 55 | | 25 | | 19 | | 13 | | 11 | | 9 | | 8 | | 6 | | 6 | | 5 | | 5 | |
| 66 | | 30 | | 22 | | 15 | | 13 | | 10 | | 10 | | 7 | | 7 | | 6 | | 6 | | 5 |
A061857 formatted as a square array:
| 0 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66 |
| 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 | |
| 1 | 2 | 4 | 5 | 7 | 10 | 12 | 15 | 19 | 22 | | |
| 1 | 2 | 3 | 5 | 6 | 8 | 10 | 13 | 15 | | | |
| 2 | 3 | 4 | 6 | 8 | 9 | 11 | 13 | | | | |
| 2 | 3 | 4 | 5 | 7 | 9 | 10 | | | | | |
| 3 | 4 | 5 | 6 | 8 | 10 | | | | | | |
| 3 | 4 | 5 | 6 | 7 | | | | | | | |
| 4 | 5 | 6 | 7 | | | | | | | | |
| 4 | 5 | 6 | | | | | | | | | |
| 5 | 6 | | | | | | | | | | |
| 5 | | | | | | | | | | | |
A061857 formatted as an upper right triangle:
| 0 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66 |
| 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 |
| | 1 | 2 | 4 | 5 | 7 | 10 | 12 | 15 | 19 | 22 |
| | | 1 | 2 | 3 | 5 | 6 | 8 | 10 | 13 | 15 |
| | | | 2 | 3 | 4 | 6 | 8 | 9 | 11 | 13 |
| | | | | 2 | 3 | 4 | 5 | 7 | 9 | 10 |
| | | | | | 3 | 4 | 5 | 6 | 8 | 10 |
| | | | | | | 3 | 4 | 5 | 6 | 7 |
| | | | | | | | 4 | 5 | 6 | 7 |
| | | | | | | | | 4 | 5 | 6 |
| | | | | | | | | | 5 | 6 |
| | | | | | | | | | | 5 |
|
