A051031 formatted as a triangular array:
| | | | | | | | | | | 1 | | | | | | | | | | | |
| | | | | | | | | | 1 | | 1 | | | | | | | | | | |
| | | | | | | | | 1 | | 0 | | 1 | | | | | | | | | |
| | | | | | | | 1 | | 1 | | 1 | | 1 | | | | | | | | |
| | | | | | | 1 | | 0 | | 1 | | 0 | | 1 | | | | | | | |
| | | | | | 1 | | 1 | | 2 | | 2 | | 1 | | 1 | | | | | | |
| | | | | 1 | | 0 | | 2 | | 0 | | 2 | | 0 | | 1 | | | | | |
| | | | 1 | | 1 | | 3 | | 6 | | 6 | | 3 | | 1 | | 1 | | | | |
| | | 1 | | 0 | | 4 | | 0 | | 16 | | 0 | | 4 | | 0 | | 1 | | | |
| | 1 | | 1 | | 5 | | 21 | | 60 | | 60 | | 21 | | 5 | | 1 | | 1 | | |
| 1 | | 0 | | 6 | | 0 | | 266 | | 0 | | 266 | | 0 | | 6 | | 0 | | 1 | |
| 1 | | 1 | | 9 | | 94 | | 1547 | | 7849 | | 7849 | | 1547 | | 94 | | 9 | | 1 | | 1 |
A051031 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | |
| 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 | 6 | 9 | | |
| 1 | 0 | 2 | 0 | 6 | 0 | 21 | 0 | 94 | | | |
| 1 | 1 | 2 | 6 | 16 | 60 | 266 | 1547 | | | | |
| 1 | 0 | 3 | 0 | 60 | 0 | 7849 | | | | | |
| 1 | 1 | 4 | 21 | 266 | 7849 | | | | | | |
| 1 | 0 | 5 | 0 | 1547 | | | | | | | |
| 1 | 1 | 6 | 94 | | | | | | | | |
| 1 | 0 | 9 | | | | | | | | | |
| 1 | 1 | | | | | | | | | | |
| 1 | | | | | | | | | | | |
A051031 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 | 6 | 9 |
| | | 1 | 0 | 2 | 0 | 6 | 0 | 21 | 0 | 94 |
| | | | 1 | 1 | 2 | 6 | 16 | 60 | 266 | 1547 |
| | | | | 1 | 0 | 3 | 0 | 60 | 0 | 7849 |
| | | | | | 1 | 1 | 4 | 21 | 266 | 7849 |
| | | | | | | 1 | 0 | 5 | 0 | 1547 |
| | | | | | | | 1 | 1 | 6 | 94 |
| | | | | | | | | 1 | 0 | 9 |
| | | | | | | | | | 1 | 1 |
| | | | | | | | | | | 1 |
|
