A001263 formatted as a triangular array:
| | | | | | | | | 1 | | | | | | | | | |
| | | | | | | | 1 | | 1 | | | | | | | | |
| | | | | | | 1 | | 3 | | 1 | | | | | | | |
| | | | | | 1 | | 6 | | 6 | | 1 | | | | | | |
| | | | | 1 | | 10 | | 20 | | 10 | | 1 | | | | | |
| | | | 1 | | 15 | | 50 | | 50 | | 15 | | 1 | | | | |
| | | 1 | | 21 | | 105 | | 175 | | 105 | | 21 | | 1 | | | |
| | 1 | | 28 | | 196 | | 490 | | 490 | | 196 | | 28 | | 1 | | |
| 1 | | 36 | | 336 | | 1176 | | 1764 | | 1176 | | 336 | | 36 | | 1 | |
| 1 | | 45 | | 540 | | 2520 | | 5292 | | 5292 | | 2520 | | 540 | | 45 | | 1 |
A001263 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | |
| 1 | 6 | 20 | 50 | 105 | 196 | 336 | 540 | | |
| 1 | 10 | 50 | 175 | 490 | 1176 | 2520 | | | |
| 1 | 15 | 105 | 490 | 1764 | 5292 | | | | |
| 1 | 21 | 196 | 1176 | 5292 | | | | | |
| 1 | 28 | 336 | 2520 | | | | | | |
| 1 | 36 | 540 | | | | | | | |
| 1 | 45 | | | | | | | | |
| 1 | | | | | | | | | |
A001263 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 |
| | 1 | 6 | 20 | 50 | 105 | 196 | 336 | 540 |
| | | 1 | 10 | 50 | 175 | 490 | 1176 | 2520 |
| | | | 1 | 15 | 105 | 490 | 1764 | 5292 |
| | | | | 1 | 21 | 196 | 1176 | 5292 |
| | | | | | 1 | 28 | 336 | 2520 |
| | | | | | | 1 | 36 | 540 |
| | | | | | | | 1 | 45 |
| | | | | | | | | 1 |
|
