A061857 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 |
| | 78 | | 36 | | 26 | | 18 | | 16 | | 12 | | 12 | | 9 | | 8 | | 7 | | 7 |
|
A061857 as a square array
| 0 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66 | 78
| | 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 | 36
| | 1 | 2 | 4 | 5 | 7 | 10 | 12 | 15 | 19 | 22 | 26
| | 1 | 2 | 3 | 5 | 6 | 8 | 10 | 13 | 15 | 18
| | 2 | 3 | 4 | 6 | 8 | 9 | 11 | 13 | 16
| | 2 | 3 | 4 | 5 | 7 | 9 | 10 | 12
| | 3 | 4 | 5 | 6 | 8 | 10 | 12
| | 3 | 4 | 5 | 6 | 7 | 9
| | 4 | 5 | 6 | 7 | 8
| | 4 | 5 | 6 | 7
| | 5 | 6 | 7
| | 5
|
A061857 as an upper right triangle
| 0 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66 | 78
| | 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 | 36
| | | 1 | 2 | 4 | 5 | 7 | 10 | 12 | 15 | 19 | 22 | 26
| | | | 1 | 2 | 3 | 5 | 6 | 8 | 10 | 13 | 15 | 18
| | | | | 2 | 3 | 4 | 6 | 8 | 9 | 11 | 13 | 16
| | | | | | 2 | 3 | 4 | 5 | 7 | 9 | 10 | 12
| | | | | | | 3 | 4 | 5 | 6 | 8 | 10 | 12
| | | | | | | | 3 | 4 | 5 | 6 | 7 | 9
| | | | | | | | | 4 | 5 | 6 | 7 | 8
| | | | | | | | | | 4 | 5 | 6 | 7
| | | | | | | | | | | 5 | 6 | 7
| | | | | | | | | | | | 5
| | | | | | | | | | | |
|
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