A168518 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 12 | | 1 |
| | | | | | | | 1 | | 51 | | 51 | | 1 |
| | | | | | | 1 | | 170 | | 514 | | 170 | | 1 |
| | | | | | 1 | | 521 | | 3646 | | 3646 | | 521 | | 1 |
| | | | | 1 | | 1552 | | 22247 | | 49472 | | 22247 | | 1552 | | 1 |
| | | | 1 | | 4591 | | 125565 | | 534995 | | 534995 | | 125565 | | 4591 | | 1 |
| | | 1 | | 13590 | | 677776 | | 5058698 | | 9506078 | | 5058698 | | 677776 | | 13590 | | 1 |
| | 1 | | 40341 | | 3560448 | | 43870968 | | 140136690 | | 140136690 | | 43870968 | | 3560448 | | 40341 | | 1 |
|
A168518 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 12 | 51 | 170 | 521 | 1552 | 4591 | 13590 | 40341
| | 1 | 51 | 514 | 3646 | 22247 | 125565 | 677776 | 3560448
| | 1 | 170 | 3646 | 49472 | 534995 | 5058698 | 43870968
| | 1 | 521 | 22247 | 534995 | 9506078 | 140136690
| | 1 | 1552 | 125565 | 5058698 | 140136690
| | 1 | 4591 | 677776 | 43870968
| | 1 | 13590 | 3560448
| | 1 | 40341
| | 1
|
A168518 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 12 | 51 | 170 | 521 | 1552 | 4591 | 13590 | 40341
| | | 1 | 51 | 514 | 3646 | 22247 | 125565 | 677776 | 3560448
| | | | 1 | 170 | 3646 | 49472 | 534995 | 5058698 | 43870968
| | | | | 1 | 521 | 22247 | 534995 | 9506078 | 140136690
| | | | | | 1 | 1552 | 125565 | 5058698 | 140136690
| | | | | | | 1 | 4591 | 677776 | 43870968
| | | | | | | | 1 | 13590 | 3560448
| | | | | | | | | 1 | 40341
| | | | | | | | | | 1
|
|
