A172431 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 2 |
| | | | | | | | | 1 | | 4 | | 3 |
| | | | | | | | 1 | | 6 | | 10 | | 4 |
| | | | | | | 1 | | 8 | | 21 | | 20 | | 5 |
| | | | | | 1 | | 10 | | 36 | | 56 | | 35 | | 6 |
| | | | | 1 | | 12 | | 55 | | 120 | | 126 | | 56 | | 7 |
| | | | 1 | | 14 | | 78 | | 220 | | 330 | | 252 | | 84 | | 8 |
| | | 1 | | 16 | | 105 | | 364 | | 715 | | 792 | | 462 | | 120 | | 9 |
| | 1 | | 18 | | 136 | | 560 | | 1365 | | 2002 | | 1716 | | 792 | | 165 | | 10 |
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A172431 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18
| 3 | 10 | 21 | 36 | 55 | 78 | 105 | 136
| 4 | 20 | 56 | 120 | 220 | 364 | 560
| 5 | 35 | 126 | 330 | 715 | 1365
| 6 | 56 | 252 | 792 | 2002
| 7 | 84 | 462 | 1716
| 8 | 120 | 792
| 9 | 165
| 10
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A172431 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18
| | | 3 | 10 | 21 | 36 | 55 | 78 | 105 | 136
| | | | 4 | 20 | 56 | 120 | 220 | 364 | 560
| | | | | 5 | 35 | 126 | 330 | 715 | 1365
| | | | | | 6 | 56 | 252 | 792 | 2002
| | | | | | | 7 | 84 | 462 | 1716
| | | | | | | | 8 | 120 | 792
| | | | | | | | | 9 | 165
| | | | | | | | | | 10
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