A156581 as a triangular array
| | | | | | | | 1 |
| | | | | | | | 1 | | 1 |
| | | | | | | 1 | | 17 | | 1 |
| | | | | | 1 | | 289 | | 289 | | 1 |
| | | | | 1 | | 4913 | | 83521 | | 4913 | | 1 |
| | | | 1 | | 83521 | | 24137569 | | 24137569 | | 83521 | | 1 |
| | | 1 | | 1419857 | | 6975757441 | | 118587876497 | | 6975757441 | | 1419857 | | 1 |
| | 1 | | 24137569 | | 2015993900449 | | 582622237229761 | | 582622237229761 | | 2015993900449 | | 24137569 | | 1 |
|
A156581 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 17 | 289 | 4913 | 83521 | 1419857 | 24137569
| | 1 | 289 | 83521 | 24137569 | 6975757441 | 2015993900449
| | 1 | 4913 | 24137569 | 118587876497 | 582622237229761
| | 1 | 83521 | 6975757441 | 582622237229761
| | 1 | 1419857 | 2015993900449
| | 1 | 24137569
| | 1
|
A156581 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 17 | 289 | 4913 | 83521 | 1419857 | 24137569
| | | 1 | 289 | 83521 | 24137569 | 6975757441 | 2015993900449
| | | | 1 | 4913 | 24137569 | 118587876497 | 582622237229761
| | | | | 1 | 83521 | 6975757441 | 582622237229761
| | | | | | 1 | 1419857 | 2015993900449
| | | | | | | 1 | 24137569
| | | | | | | | 1
|
|
