A168561 as a triangular array
| | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | 0 | | 1 |
| | | | | | | | | | | | 1 | | 0 | | 1 |
| | | | | | | | | | | 0 | | 2 | | 0 | | 1 |
| | | | | | | | | | 1 | | 0 | | 3 | | 0 | | 1 |
| | | | | | | | | 0 | | 3 | | 0 | | 4 | | 0 | | 1 |
| | | | | | | | 1 | | 0 | | 6 | | 0 | | 5 | | 0 | | 1 |
| | | | | | | 0 | | 4 | | 0 | | 10 | | 0 | | 6 | | 0 | | 1 |
| | | | | | 1 | | 0 | | 10 | | 0 | | 15 | | 0 | | 7 | | 0 | | 1 |
| | | | | 0 | | 5 | | 0 | | 20 | | 0 | | 21 | | 0 | | 8 | | 0 | | 1 |
| | | | 1 | | 0 | | 15 | | 0 | | 35 | | 0 | | 28 | | 0 | | 9 | | 0 | | 1 |
| | | 0 | | 6 | | 0 | | 35 | | 0 | | 56 | | 0 | | 36 | | 0 | | 10 | | 0 | | 1 |
| | 1 | | 0 | | 21 | | 0 | | 70 | | 0 | | 84 | | 0 | | 45 | | 0 | | 11 | | 0 | | 1 |
|
A168561 as a square array
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1
| | 1 | 0 | 2 | 0 | 3 | 0 | 4 | 0 | 5 | 0 | 6 | 0
| | 1 | 0 | 3 | 0 | 6 | 0 | 10 | 0 | 15 | 0 | 21
| | 1 | 0 | 4 | 0 | 10 | 0 | 20 | 0 | 35 | 0
| | 1 | 0 | 5 | 0 | 15 | 0 | 35 | 0 | 70
| | 1 | 0 | 6 | 0 | 21 | 0 | 56 | 0
| | 1 | 0 | 7 | 0 | 28 | 0 | 84
| | 1 | 0 | 8 | 0 | 36 | 0
| | 1 | 0 | 9 | 0 | 45
| | 1 | 0 | 10 | 0
| | 1 | 0 | 11
| | 1 | 0
| | 1
|
A168561 as an upper right triangle
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1
| | 1 | 0 | 2 | 0 | 3 | 0 | 4 | 0 | 5 | 0 | 6 | 0
| | | 1 | 0 | 3 | 0 | 6 | 0 | 10 | 0 | 15 | 0 | 21
| | | | 1 | 0 | 4 | 0 | 10 | 0 | 20 | 0 | 35 | 0
| | | | | 1 | 0 | 5 | 0 | 15 | 0 | 35 | 0 | 70
| | | | | | 1 | 0 | 6 | 0 | 21 | 0 | 56 | 0
| | | | | | | 1 | 0 | 7 | 0 | 28 | 0 | 84
| | | | | | | | 1 | 0 | 8 | 0 | 36 | 0
| | | | | | | | | 1 | 0 | 9 | 0 | 45
| | | | | | | | | | 1 | 0 | 10 | 0
| | | | | | | | | | | 1 | 0 | 11
| | | | | | | | | | | | 1 | 0
| | | | | | | | | | | | | 1
|
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