A181657 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | 3 | | 2 | | 1 | | 1 |
| | | | | | | | 3 | | 2 | | 1 | | 1 | | 1 |
| | | | | | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 |
| | | | | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 | | 1 |
| | | | | 17 | | 12 | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 |
| | | | 17 | | 12 | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 | | 1 |
| | | 41 | | 29 | | 17 | | 12 | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 |
| | 41 | | 29 | | 17 | | 12 | | 7 | | 5 | | 3 | | 2 | | 1 | | 1 | | 1 |
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A181657 as a square array
1 | 1 | 1 | 3 | 3 | 7 | 7 | 17 | 17 | 41 | 41
| 1 | 1 | 2 | 2 | 5 | 5 | 12 | 12 | 29 | 29
| 1 | 1 | 1 | 3 | 3 | 7 | 7 | 17 | 17
| 1 | 1 | 2 | 2 | 5 | 5 | 12 | 12
| 1 | 1 | 1 | 3 | 3 | 7 | 7
| 1 | 1 | 2 | 2 | 5 | 5
| 1 | 1 | 1 | 3 | 3
| 1 | 1 | 2 | 2
| 1 | 1 | 1
| 1 | 1
| 1
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A181657 as an upper right triangle
1 | 1 | 1 | 3 | 3 | 7 | 7 | 17 | 17 | 41 | 41
| | 1 | 1 | 2 | 2 | 5 | 5 | 12 | 12 | 29 | 29
| | | 1 | 1 | 1 | 3 | 3 | 7 | 7 | 17 | 17
| | | | 1 | 1 | 2 | 2 | 5 | 5 | 12 | 12
| | | | | 1 | 1 | 1 | 3 | 3 | 7 | 7
| | | | | | 1 | 1 | 2 | 2 | 5 | 5
| | | | | | | 1 | 1 | 1 | 3 | 3
| | | | | | | | 1 | 1 | 2 | 2
| | | | | | | | | 1 | 1 | 1
| | | | | | | | | | 1 | 1
| | | | | | | | | | | 1
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