A046521 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 2 | | 1 |
| | | | | | | | | 6 | | 6 | | 1 |
| | | | | | | | 20 | | 30 | | 10 | | 1 |
| | | | | | | 70 | | 140 | | 70 | | 14 | | 1 |
| | | | | | 252 | | 630 | | 420 | | 126 | | 18 | | 1 |
| | | | | 924 | | 2772 | | 2310 | | 924 | | 198 | | 22 | | 1 |
| | | | 3432 | | 12012 | | 12012 | | 6006 | | 1716 | | 286 | | 26 | | 1 |
| | | 12870 | | 51480 | | 60060 | | 36036 | | 12870 | | 2860 | | 390 | | 30 | | 1 |
| | 48620 | | 218790 | | 291720 | | 204204 | | 87516 | | 24310 |
|
A046521 as a square array
1 | 2 | 6 | 20 | 70 | 252 | 924 | 3432 | 12870 | 48620
| 1 | 6 | 30 | 140 | 630 | 2772 | 12012 | 51480 | 218790
| 1 | 10 | 70 | 420 | 2310 | 12012 | 60060 | 291720
| 1 | 14 | 126 | 924 | 6006 | 36036 | 204204
| 1 | 18 | 198 | 1716 | 12870 | 87516
| 1 | 22 | 286 | 2860 | 24310
| 1 | 26 | 390
| 1 | 30
| 1
|
A046521 as an upper right triangle
1 | 2 | 6 | 20 | 70 | 252 | 924 | 3432 | 12870 | 48620
| | 1 | 6 | 30 | 140 | 630 | 2772 | 12012 | 51480 | 218790
| | | 1 | 10 | 70 | 420 | 2310 | 12012 | 60060 | 291720
| | | | 1 | 14 | 126 | 924 | 6006 | 36036 | 204204
| | | | | 1 | 18 | 198 | 1716 | 12870 | 87516
| | | | | | 1 | 22 | 286 | 2860 | 24310
| | | | | | | 1 | 26 | 390
| | | | | | | | 1 | 30
| | | | | | | | | 1
| | | | | | | | |
|
|