A001263 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 |
| | 1 | | 55 | | 825 | | 4950 | | 13860 | | 19404 | | 13860 | | 4950 | | 825 |
|
A001263 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| | 1 | 6 | 20 | 50 | 105 | 196 | 336 | 540 | 825
| | 1 | 10 | 50 | 175 | 490 | 1176 | 2520 | 4950
| | 1 | 15 | 105 | 490 | 1764 | 5292 | 13860
| | 1 | 21 | 196 | 1176 | 5292 | 19404
| | 1 | 28 | 336 | 2520 | 13860
| | 1 | 36 | 540 | 4950
| | 1 | 45 | 825
| | 1
|
A001263 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| | | 1 | 6 | 20 | 50 | 105 | 196 | 336 | 540 | 825
| | | | 1 | 10 | 50 | 175 | 490 | 1176 | 2520 | 4950
| | | | | 1 | 15 | 105 | 490 | 1764 | 5292 | 13860
| | | | | | 1 | 21 | 196 | 1176 | 5292 | 19404
| | | | | | | 1 | 28 | 336 | 2520 | 13860
| | | | | | | | 1 | 36 | 540 | 4950
| | | | | | | | | 1 | 45 | 825
| | | | | | | | | | 1
| | | | | | | | | |
|
|
