A209491 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 3 | | 0 |
| | | | | | | | | | 8 | | 0 | | 0 |
| | | | | | | | | 20 | | 4 | | 0 | | 0 |
| | | | | | | | 47 | | 15 | | 0 | | 0 | | 0 |
| | | | | | | 107 | | 37 | | 0 | | 0 | | 0 | | 0 |
| | | | | | 238 | | 87 | | 16 | | 0 | | 0 | | 0 | | 0 |
| | | | | 520 | | 200 | | 60 | | 0 | | 0 | | 0 | | 0 | | 0 |
| | | | 1121 | | 448 | | 169 | | 0 | | 0 | | 0 | | 0 | | 0 | | 0 |
| | | 2391 | | 992 | | 387 | | 64 | | 0 | | 0 | | 0 | | 0 | | 0 | | 0 |
| | 5056 | | 2160 | | 865 | | 240 | | 0 | | 0 | | 0 | | 0 | | 0 | | 0 | | 0 |
|
A209491 as a square array
1 | 3 | 8 | 20 | 47 | 107 | 238 | 520 | 1121 | 2391 | 5056
| 0 | 0 | 4 | 15 | 37 | 87 | 200 | 448 | 992 | 2160
| 0 | 0 | 0 | 0 | 16 | 60 | 169 | 387 | 865
| 0 | 0 | 0 | 0 | 0 | 0 | 64 | 240
| 0 | 0 | 0 | 0 | 0 | 0 | 0
| 0 | 0 | 0 | 0 | 0 | 0
| 0 | 0 | 0 | 0 | 0
| 0 | 0 | 0 | 0
| 0 | 0 | 0
| 0 | 0
| 0
|
A209491 as an upper right triangle
1 | 3 | 8 | 20 | 47 | 107 | 238 | 520 | 1121 | 2391 | 5056
| | 0 | 0 | 4 | 15 | 37 | 87 | 200 | 448 | 992 | 2160
| | | 0 | 0 | 0 | 0 | 16 | 60 | 169 | 387 | 865
| | | | 0 | 0 | 0 | 0 | 0 | 0 | 64 | 240
| | | | | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | | | | | 0 | 0 | 0 | 0 | 0 | 0
| | | | | | | 0 | 0 | 0 | 0 | 0
| | | | | | | | 0 | 0 | 0 | 0
| | | | | | | | | 0 | 0 | 0
| | | | | | | | | | 0 | 0
| | | | | | | | | | | 0
|
|