A291980 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 2 | | 1 |
| | | | | | | | 2 | | 3 | | 3 | | 1 |
| | | | | | | 4 | | 8 | | 6 | | 4 | | 1 |
| | | | | | 14 | | 20 | | 20 | | 10 | | 5 | | 1 |
| | | | | 38 | | 84 | | 60 | | 40 | | 15 | | 6 | | 1 |
| | | | 216 | | 266 | | 294 | | 140 | | 70 | | 21 | | 7 | | 1 |
| | | 600 | | 1728 | | 1064 | | 784 | | 280 | | 112 | | 28 | | 8 | | 1 |
| | 6240 | | 5400 | | 7776 | | 3192 | | 1764 | | 504 | | 168 | | 36 | | 9 | | 1 |
|
A291980 as a square array
| 1 | 1 | 1 | 2 | 4 | 14 | 38 | 216 | 600 | 6240
| | 1 | 2 | 3 | 8 | 20 | 84 | 266 | 1728 | 5400
| | 1 | 3 | 6 | 20 | 60 | 294 | 1064 | 7776
| | 1 | 4 | 10 | 40 | 140 | 784 | 3192
| | 1 | 5 | 15 | 70 | 280 | 1764
| | 1 | 6 | 21 | 112 | 504
| | 1 | 7 | 28 | 168
| | 1 | 8 | 36
| | 1 | 9
| | 1
|
A291980 as an upper right triangle
| 1 | 1 | 1 | 2 | 4 | 14 | 38 | 216 | 600 | 6240
| | 1 | 2 | 3 | 8 | 20 | 84 | 266 | 1728 | 5400
| | | 1 | 3 | 6 | 20 | 60 | 294 | 1064 | 7776
| | | | 1 | 4 | 10 | 40 | 140 | 784 | 3192
| | | | | 1 | 5 | 15 | 70 | 280 | 1764
| | | | | | 1 | 6 | 21 | 112 | 504
| | | | | | | 1 | 7 | 28 | 168
| | | | | | | | 1 | 8 | 36
| | | | | | | | | 1 | 9
| | | | | | | | | | 1
|
|
