A173918 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 4 | | 1 |
| | | | | | | 1 | | 28 | | 28 | | 1 |
| | | | | | 1 | | 133 | | 931 | | 133 | | 1 |
| | | | | 1 | | 760 | | 25270 | | 25270 | | 760 | | 1 |
| | | | 1 | | 3880 | | 737200 | | 3501700 | | 737200 | | 3880 | | 1 |
| | | 1 | | 21049 | | 20417530 | | 554190100 | | 554190100 | | 20417530 | | 21049 | | 1 |
| | 1 | | 110236 | | 580089391 | | 80383815610 | | 459336089200 |
|
A173918 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 28 | 133 | 760 | 3880 | 21049 | 110236
| | 1 | 28 | 931 | 25270 | 737200 | 20417530 | 580089391
| | 1 | 133 | 25270 | 3501700 | 554190100 | 80383815610
| | 1 | 760 | 737200 | 554190100 | 459336089200
| | 1 | 3880 | 20417530
| | 1 | 21049
| | 1
|
A173918 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 28 | 133 | 760 | 3880 | 21049 | 110236
| | | 1 | 28 | 931 | 25270 | 737200 | 20417530 | 580089391
| | | | 1 | 133 | 25270 | 3501700 | 554190100 | 80383815610
| | | | | 1 | 760 | 737200 | 554190100 | 459336089200
| | | | | | 1 | 3880 | 20417530
| | | | | | | 1 | 21049
| | | | | | | | 1
| | | | | | | |
|
|
