A165661 as a triangular array
| | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | | | 1 | | 1 | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 3 | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 2 | | 2 | | 1 | | 1 |
| | | | | | | | 1 | | 1 | | 5 | | 10 | | 5 | | 1 | | 1 |
| | | | | | | 1 | | 1 | | 3 | | 5 | | 5 | | 3 | | 1 | | 1 |
| | | | | | 1 | | 1 | | 7 | | 7 | | 35 | | 7 | | 7 | | 1 | | 1 |
| | | | | 1 | | 1 | | 4 | | 28 | | 14 | | 14 | | 28 | | 4 | | 1 | | 1 |
| | | | 1 | | 1 | | 9 | | 12 | | 21 | | 126 | | 21 | | 12 | | 9 | | 1 | | 1 |
| | | 1 | | 1 | | 5 | | 15 | | 30 | | 42 | | 42 | | 30 | | 15 | | 5 | | 1 | | 1 |
| | 1 | | 1 | | 11 | | 55 | | 165 | | 66 | | 77 | | 66 | | 165 | | 55 | | 11 | | 1 | | 1 |
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A165661 as a square array
| 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 | 3 | 2 | 5 | 3 | 7 | 4 | 9 | 5 | 11
| | 1 | 1 | 2 | 10 | 5 | 7 | 28 | 12 | 15 | 55
| | 1 | 1 | 5 | 5 | 35 | 14 | 21 | 30 | 165
| | 1 | 1 | 3 | 7 | 14 | 126 | 42 | 66
| | 1 | 1 | 7 | 28 | 21 | 42 | 77
| | 1 | 1 | 4 | 12 | 30 | 66
| | 1 | 1 | 9 | 15 | 165
| | 1 | 1 | 5 | 55
| | 1 | 1 | 11
| | 1 | 1
| | 1
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A165661 as an upper right triangle
| 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 | 3 | 2 | 5 | 3 | 7 | 4 | 9 | 5 | 11
| | | | 1 | 1 | 2 | 10 | 5 | 7 | 28 | 12 | 15 | 55
| | | | | 1 | 1 | 5 | 5 | 35 | 14 | 21 | 30 | 165
| | | | | | 1 | 1 | 3 | 7 | 14 | 126 | 42 | 66
| | | | | | | 1 | 1 | 7 | 28 | 21 | 42 | 77
| | | | | | | | 1 | 1 | 4 | 12 | 30 | 66
| | | | | | | | | 1 | 1 | 9 | 15 | 165
| | | | | | | | | | 1 | 1 | 5 | 55
| | | | | | | | | | | 1 | 1 | 11
| | | | | | | | | | | | 1 | 1
| | | | | | | | | | | | | 1
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