A172356 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 1 | | 1 |
| | | | | | | | 1 | | 2 | | 2 | | 2 | | 1 |
| | | | | | | 1 | | 3 | | 6 | | 6 | | 3 | | 1 |
| | | | | | 1 | | 4 | | 12 | | 24 | | 12 | | 4 | | 1 |
| | | | | 1 | | 6 | | 24 | | 72 | | 72 | | 24 | | 6 | | 1 |
| | | | 1 | | 9 | | 54 | | 216 | | 324 | | 216 | | 54 | | 9 | | 1 |
| | | 1 | | 13 | | 117 | | 702 | | 1404 | | 1404 | | 702 | | 117 | | 13 | | 1 |
| | 1 | | 19 | | 247 | | 2223 | | 6669 | | 8892 | | 6669 | | 2223 | | 247 | | 19 | | 1 |
|
A172356 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 2 | 3 | 4 | 6 | 9 | 13 | 19
| | 1 | 1 | 2 | 6 | 12 | 24 | 54 | 117 | 247
| | 1 | 2 | 6 | 24 | 72 | 216 | 702 | 2223
| | 1 | 3 | 12 | 72 | 324 | 1404 | 6669
| | 1 | 4 | 24 | 216 | 1404 | 8892
| | 1 | 6 | 54 | 702 | 6669
| | 1 | 9 | 117 | 2223
| | 1 | 13 | 247
| | 1 | 19
| | 1
|
A172356 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 2 | 3 | 4 | 6 | 9 | 13 | 19
| | | 1 | 1 | 2 | 6 | 12 | 24 | 54 | 117 | 247
| | | | 1 | 2 | 6 | 24 | 72 | 216 | 702 | 2223
| | | | | 1 | 3 | 12 | 72 | 324 | 1404 | 6669
| | | | | | 1 | 4 | 24 | 216 | 1404 | 8892
| | | | | | | 1 | 6 | 54 | 702 | 6669
| | | | | | | | 1 | 9 | 117 | 2223
| | | | | | | | | 1 | 13 | 247
| | | | | | | | | | 1 | 19
| | | | | | | | | | | 1
|
|
