A220691 as a triangular array
| | | | | | | | | | | | | 0 |
| | | | | | | | | | | | | 0 | | 1 |
| | | | | | | | | | | | 0 | | 0 | | 3 |
| | | | | | | | | | | 0 | | 1 | | 1 | | 6 |
| | | | | | | | | | 0 | | 0 | | 1 | | 2 | | 10 |
| | | | | | | | | 0 | | 0 | | 1 | | 2 | | 4 | | 15 |
| | | | | | | | 0 | | 0 | | 1 | | 1 | | 4 | | 6 | | 21 |
| | | | | | | 0 | | 0 | | 0 | | 2 | | 2 | | 5 | | 9 | | 28 |
| | | | | | 0 | | 0 | | 0 | | 1 | | 2 | | 3 | | 7 | | 12 | | 36 |
| | | | | 0 | | 0 | | 0 | | 1 | | 2 | | 3 | | 5 | | 10 | | 16 | | 45 |
| | | | 0 | | 0 | | 0 | | 0 | | 2 | | 2 | | 4 | | 6 | | 12 | | 20 | | 55 |
| | | 0 | | 0 | | 0 | | 0 | | 1 | | 3 | | 3 | | 6 | | 8 | | 15 | | 25 | | 66 |
| | 0 | | 0 | | 0 | | 0 |
|
A220691 as a square array
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | 3 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0
| | 6 | 2 | 2 | 1 | 2 | 1 | 1 | 0 | 0 | 0
| | 10 | 4 | 4 | 2 | 2 | 2 | 2 | 1
| | 15 | 6 | 5 | 3 | 3 | 2 | 3
| | 21 | 9 | 7 | 5 | 4 | 3
| | 28 | 12 | 10 | 6 | 6
| | 36 | 16 | 12 | 8
| | 45 | 20 | 15
| | 55 | 25
| | 66
|
A220691 as an upper right triangle
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | | 3 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0
| | | | 6 | 2 | 2 | 1 | 2 | 1 | 1 | 0 | 0 | 0
| | | | | 10 | 4 | 4 | 2 | 2 | 2 | 2 | 1
| | | | | | 15 | 6 | 5 | 3 | 3 | 2 | 3
| | | | | | | 21 | 9 | 7 | 5 | 4 | 3
| | | | | | | | 28 | 12 | 10 | 6 | 6
| | | | | | | | | 36 | 16 | 12 | 8
| | | | | | | | | | 45 | 20 | 15
| | | | | | | | | | | 55 | 25
| | | | | | | | | | | | 66
| | | | | | | | | | | |
|
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