A001009 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 1 | | 1 |
| | | | | | | 1 | | 3 | | 4 | | 4 |
| | | | | | 1 | | 11 | | 46 | | 56 | | 56 |
| | | | | 1 | | 53 | | 1064 | | 6552 | | 9408 | | 9408 |
| | | | 1 | | 309 | | 35792 | | 1293216 | | 11270400 | | 16942080 | | 16942080 |
| | | 1 | | 2119 | | 1673792 | | 420909504 | | 27206658048 | | 335390189568 | | 535281401856 | | 535281401856 |
| | 1 | | 16687 | | 103443808 |
|
A001009 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 3 | 11 | 53 | 309 | 2119 | 16687
| | 1 | 4 | 46 | 1064 | 35792 | 1673792 | 103443808
| | 4 | 56 | 6552 | 1293216 | 420909504
| | 56 | 9408 | 11270400 | 27206658048
| | 9408 | 16942080 | 335390189568
| | 16942080 | 535281401856
| | 535281401856
|
A001009 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 3 | 11 | 53 | 309 | 2119 | 16687
| | | 1 | 4 | 46 | 1064 | 35792 | 1673792 | 103443808
| | | | 4 | 56 | 6552 | 1293216 | 420909504
| | | | | 56 | 9408 | 11270400 | 27206658048
| | | | | | 9408 | 16942080 | 335390189568
| | | | | | | 16942080 | 535281401856
| | | | | | | | 535281401856
| | | | | | | |
|
|
