A133721 as a triangular array
| | | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | | | | 1 | | 1 | | 1 | | 1 |
| | | | | | | | | | | 1 | | 3 | | 1 | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | | | | | | | 1 | | 6 | | 7 | | 1 | | 1 | | 1 | | 1 |
| | | | | | | | 1 | | 1 | | 3 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | | | | | 1 | | 10 | | 1 | | 13 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | | | | 1 | | 1 | | 25 | | 7 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | | | 1 | | 15 | | 6 | | 3 | | 22 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | | 1 | | 1 | | 1 | | 1 | | 13 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | 1 | | 21 | | 65 | | 81 | | 7 | | 34 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | 1 | | 1 | | 10 |
|
A133721 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 3 | 1 | 6 | 1 | 10 | 1 | 15 | 1 | 21 | 1
| | 1 | 1 | 1 | 1 | 7 | 3 | 1 | 25 | 6 | 1 | 65 | 10
| | 1 | 1 | 1 | 1 | 1 | 13 | 7 | 3 | 1 | 81
| | 1 | 1 | 1 | 1 | 1 | 1 | 22 | 13 | 7
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 34
| | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1
| | 1 | 1 | 1
| | 1 | 1
| | 1
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A133721 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 3 | 1 | 6 | 1 | 10 | 1 | 15 | 1 | 21 | 1
| | | 1 | 1 | 1 | 1 | 7 | 3 | 1 | 25 | 6 | 1 | 65 | 10
| | | | 1 | 1 | 1 | 1 | 1 | 13 | 7 | 3 | 1 | 81
| | | | | 1 | 1 | 1 | 1 | 1 | 1 | 22 | 13 | 7
| | | | | | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 34
| | | | | | | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | | | | | | 1 | 1 | 1 | 1 | 1 | 1
| | | | | | | | | 1 | 1 | 1 | 1 | 1
| | | | | | | | | | 1 | 1 | 1 | 1
| | | | | | | | | | | 1 | 1 | 1
| | | | | | | | | | | | 1 | 1
| | | | | | | | | | | | | 1
| | | | | | | | | | | | |
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