A221824 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 3 | | 3 |
| | | | | | | | 6 | | 31 | | 6 |
| | | | | | | 13 | | 252 | | 252 | | 13 |
| | | | | | 28 | | 2113 | | 6711 | | 2113 | | 28 |
| | | | | 60 | | 17684 | | 190756 | | 190756 | | 17684 | | 60 |
| | | | 129 | | 147920 | | 5374720 | | 18636989 | | 5374720 | | 147920 | | 129 |
| | | 277 | | 1237439 | | 151592441 | | 1804472268 | | 1804472268 | | 151592441 | | 1237439 | | 277 |
| | 595 | | 10351593 |
|
A221824 as a square array
1 | 3 | 6 | 13 | 28 | 60 | 129 | 277 | 595
| 3 | 31 | 252 | 2113 | 17684 | 147920 | 1237439 | 10351593
| 6 | 252 | 6711 | 190756 | 5374720 | 151592441
| 13 | 2113 | 190756 | 18636989 | 1804472268
| 28 | 17684 | 5374720 | 1804472268
| 60 | 147920 | 151592441
| 129 | 1237439
| 277
|
A221824 as an upper right triangle
1 | 3 | 6 | 13 | 28 | 60 | 129 | 277 | 595
| | 3 | 31 | 252 | 2113 | 17684 | 147920 | 1237439 | 10351593
| | | 6 | 252 | 6711 | 190756 | 5374720 | 151592441
| | | | 13 | 2113 | 190756 | 18636989 | 1804472268
| | | | | 28 | 17684 | 5374720 | 1804472268
| | | | | | 60 | 147920 | 151592441
| | | | | | | 129 | 1237439
| | | | | | | | 277
| | | | | | | |
|
|