A181985 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 1 | | 1 |
| | | | | | | 1 | | 1 | | 5 | | 1 |
| | | | | | 1 | | 1 | | 19 | | 61 | | 1 |
| | | | | 1 | | 1 | | 69 | | 1513 | | 1385 | | 1 |
| | | | 1 | | 1 | | 251 | | 33661 | | 315523 | | 50521 | | 1 |
| | | 1 | | 1 | | 923 | | 750751 | | 60376809 | | 136085041 | | 2702765 | | 1 |
| | 1 | | 1 | | 3431 | | 17116009 | | 11593285251 | | 288294050521 | | 105261234643 | | 199360981 | | 1 |
|
A181985 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 5 | 19 | 69 | 251 | 923 | 3431
| | 1 | 61 | 1513 | 33661 | 750751 | 17116009
| | 1 | 1385 | 315523 | 60376809 | 11593285251
| | 1 | 50521 | 136085041 | 288294050521
| | 1 | 2702765 | 105261234643
| | 1 | 199360981
| | 1
|
A181985 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | 1 | 5 | 19 | 69 | 251 | 923 | 3431
| | | | 1 | 61 | 1513 | 33661 | 750751 | 17116009
| | | | | 1 | 1385 | 315523 | 60376809 | 11593285251
| | | | | | 1 | 50521 | 136085041 | 288294050521
| | | | | | | 1 | 2702765 | 105261234643
| | | | | | | | 1 | 199360981
| | | | | | | | | 1
|
|
