A181320 as a triangular array
| | | | | | | 1 |
| | | | | | | 1 | | 1 |
| | | | | | 2 | | 7 | | 5 |
| | | | | 6 | | 48 | | 91 | | 49 |
| | | | 24 | | 360 | | 1304 | | 1697 | | 729 |
| | | 120 | | 3000 | | 17910 | | 41440 | | 41051 | | 14641 |
| | 720 | | 27720 | | 249900 | | 899730 | | 1524282 | | 1218745 | | 371293 |
|
A181320 as a square array
| 1 | 1 | 2 | 6 | 24 | 120 | 720
| | 1 | 7 | 48 | 360 | 3000 | 27720
| | 5 | 91 | 1304 | 17910 | 249900
| | 49 | 1697 | 41440 | 899730
| | 729 | 41051 | 1524282
| | 14641 | 1218745
| | 371293
|
A181320 as an upper right triangle
| 1 | 1 | 2 | 6 | 24 | 120 | 720
| | 1 | 7 | 48 | 360 | 3000 | 27720
| | | 5 | 91 | 1304 | 17910 | 249900
| | | | 49 | 1697 | 41440 | 899730
| | | | | 729 | 41051 | 1524282
| | | | | | 14641 | 1218745
| | | | | | | 371293
|
|
