A161642 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | 1 | | 3 | | 3 | | 1 |
| | | | | | | | 1 | | 2 | | 2 | | 2 | | 1 |
| | | | | | | 1 | | 5 | | 10 | | 10 | | 5 | | 1 |
| | | | | | 1 | | 3 | | 15 | | 5 | | 15 | | 3 | | 1 |
| | | | | 1 | | 7 | | 7 | | 35 | | 35 | | 7 | | 7 | | 1 |
| | | | 1 | | 4 | | 28 | | 28 | | 14 | | 28 | | 28 | | 4 | | 1 |
| | | 1 | | 9 | | 36 | | 84 | | 126 | | 126 | | 84 | | 36 | | 9 | | 1 |
| | 1 | | 5 | | 15 | | 30 | | 210 | | 42 | | 210 | | 30 | | 15 | | 5 | | 1 |
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A161642 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 1 | 1 | 3 | 2 | 5 | 3 | 7 | 4 | 9 | 5
| 1 | 3 | 2 | 10 | 15 | 7 | 28 | 36 | 15
| 1 | 2 | 10 | 5 | 35 | 28 | 84 | 30
| 1 | 5 | 15 | 35 | 14 | 126 | 210
| 1 | 3 | 7 | 28 | 126 | 42
| 1 | 7 | 28 | 84 | 210
| 1 | 4 | 36 | 30
| 1 | 9 | 15
| 1 | 5
| 1
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A161642 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 3 | 2 | 5 | 3 | 7 | 4 | 9 | 5
| | | 1 | 3 | 2 | 10 | 15 | 7 | 28 | 36 | 15
| | | | 1 | 2 | 10 | 5 | 35 | 28 | 84 | 30
| | | | | 1 | 5 | 15 | 35 | 14 | 126 | 210
| | | | | | 1 | 3 | 7 | 28 | 126 | 42
| | | | | | | 1 | 7 | 28 | 84 | 210
| | | | | | | | 1 | 4 | 36 | 30
| | | | | | | | | 1 | 9 | 15
| | | | | | | | | | 1 | 5
| | | | | | | | | | | 1
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