A287920 as a triangular array
| | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | | 2 | | 1 | | 1 |
| | | | | | | | | | | 3 | | 2 | | 1 | | 1 |
| | | | | | | | | | 5 | | 3 | | 2 | | 1 | | 1 |
| | | | | | | | | 6 | | 4 | | 2 | | 1 | | 1 | | 1 |
| | | | | | | | 8 | | 5 | | 3 | | 2 | | 1 | | 1 | | 1 |
| | | | | | | 9 | | 6 | | 3 | | 2 | | 1 | | 1 | | 1 | | 1 |
| | | | | | 11 | | 7 | | 4 | | 3 | | 2 | | 1 | | 1 | | 1 | | 1 |
| | | | | 14 | | 9 | | 5 | | 4 | | 2 | | 2 | | 1 | | 1 | | 1 | | 1 |
| | | | 15 | | 10 | | 6 | | 4 | | 2 | | 2 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | | 18 | | 12 | | 7 | | 5 | | 3 | | 2 | | 2 | | 1 | | 1 | | 1 | | 1 | | 1 |
| | 20 | | 13 | | 8 | | 5 | | 3 | | 3 | | 2 | | 2 | | 1 | | 1 | | 1 | | 1 | | 1 |
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A287920 as a square array
| 1 | 1 | 2 | 3 | 5 | 6 | 8 | 9 | 11 | 14 | 15 | 18 | 20
| | 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | 10 | 12 | 13
| | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | 7 | 8
| | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 4 | 5 | 5
| | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3
| | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3
| | 1 | 1 | 1 | 1 | 1 | 2 | 2
| | 1 | 1 | 1 | 1 | 1 | 2
| | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1
| | 1 | 1 | 1
| | 1 | 1
| | 1
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A287920 as an upper right triangle
| 1 | 1 | 2 | 3 | 5 | 6 | 8 | 9 | 11 | 14 | 15 | 18 | 20
| | 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | 10 | 12 | 13
| | | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | 7 | 8
| | | | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 4 | 5 | 5
| | | | | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3
| | | | | | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3
| | | | | | | 1 | 1 | 1 | 1 | 1 | 2 | 2
| | | | | | | | 1 | 1 | 1 | 1 | 1 | 2
| | | | | | | | | 1 | 1 | 1 | 1 | 1
| | | | | | | | | | 1 | 1 | 1 | 1
| | | | | | | | | | | 1 | 1 | 1
| | | | | | | | | | | | 1 | 1
| | | | | | | | | | | | | 1
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