A022171 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 8 | | 1 |
| | | | | | | 1 | | 57 | | 57 | | 1 |
| | | | | | 1 | | 400 | | 2850 | | 400 | | 1 |
| | | | | 1 | | 2801 | | 140050 | | 140050 | | 2801 | | 1 |
| | | | 1 | | 19608 | | 6865251 | | 48177200 | | 6865251 | | 19608 | | 1 |
| | | 1 | | 137257 | | 336416907 | | 16531644851 | | 16531644851 | | 336416907 | | 137257 | | 1 |
| | 1 |
|
A022171 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 8 | 57 | 400 | 2801 | 19608 | 137257
| | 1 | 57 | 2850 | 140050 | 6865251 | 336416907
| | 1 | 400 | 140050 | 48177200 | 16531644851
| | 1 | 2801 | 6865251 | 16531644851
| | 1 | 19608 | 336416907
| | 1 | 137257
| | 1
|
A022171 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 8 | 57 | 400 | 2801 | 19608 | 137257
| | | 1 | 57 | 2850 | 140050 | 6865251 | 336416907
| | | | 1 | 400 | 140050 | 48177200 | 16531644851
| | | | | 1 | 2801 | 6865251 | 16531644851
| | | | | | 1 | 19608 | 336416907
| | | | | | | 1 | 137257
| | | | | | | | 1
| | | | | | | |
|
|
