A131255 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 0 | | 1 |
| | | | | | | | | 0 | | 1 | | 1 |
| | | | | | | | 1 | | 0 | | 2 | | 1 |
| | | | | | | 0 | | 1 | | 1 | | 3 | | 1 |
| | | | | | 0 | | 1 | | 1 | | 3 | | 4 | | 1 |
| | | | | 1 | | 0 | | 2 | | 2 | | 6 | | 5 | | 1 |
| | | | 0 | | 1 | | 1 | | 3 | | 5 | | 10 | | 6 | | 1 |
| | | 0 | | 1 | | 1 | | 3 | | 5 | | 11 | | 15 | | 7 | | 1 |
| | 1 | | 0 | | 2 | | 2 | | 6 | | 10 | | 21 | | 21 | | 8 | | 1 |
|
A131255 as a square array
| 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1
| | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0
| | 1 | 2 | 1 | 1 | 2 | 1 | 1 | 2
| | 1 | 3 | 3 | 2 | 3 | 3 | 2
| | 1 | 4 | 6 | 5 | 5 | 6
| | 1 | 5 | 10 | 11 | 10
| | 1 | 6 | 15 | 21
| | 1 | 7 | 21
| | 1 | 8
| | 1
|
A131255 as an upper right triangle
| 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1
| | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0
| | | 1 | 2 | 1 | 1 | 2 | 1 | 1 | 2
| | | | 1 | 3 | 3 | 2 | 3 | 3 | 2
| | | | | 1 | 4 | 6 | 5 | 5 | 6
| | | | | | 1 | 5 | 10 | 11 | 10
| | | | | | | 1 | 6 | 15 | 21
| | | | | | | | 1 | 7 | 21
| | | | | | | | | 1 | 8
| | | | | | | | | | 1
|
|
