A221857 as a triangular array
| | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | | 1 | | 1 | | 0 |
| | | | | | | | | | | 1 | | 1 | | 1 | | 0 |
| | | | | | | | | | 1 | | 1 | | 2 | | 1 | | 0 |
| | | | | | | | | 1 | | 1 | | 3 | | 1 | | 1 | | 0 |
| | | | | | | | 1 | | 1 | | 4 | | 3 | | 4 | | 1 | | 0 |
| | | | | | | 1 | | 1 | | 5 | | 6 | | 1 | | 4 | | 1 | | 0 |
| | | | | | 1 | | 1 | | 6 | | 10 | | 4 | | 9 | | 4 | | 1 | | 0 |
| | | | | 1 | | 1 | | 7 | | 15 | | 10 | | 1 | | 27 | | 1 | | 1 | | 0 |
| | | | 1 | | 1 | | 8 | | 21 | | 20 | | 5 | | 16 | | 27 | | 8 | | 1 | | 0 |
| | | 1 | | 1 | | 9 | | 28 | | 35 | | 15 | | 1 | | 96 | | 81 | | 16 | | 1 | | 0 |
| | 1 | | 1 | | 10 | | 36 | | 56 | | 35 | | 6 | | 25 | | 256 | | 81 | | 32 | | 1 | | 0 |
|
A221857 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10
| | 0 | 1 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36
| | 0 | 1 | 4 | 1 | 4 | 10 | 20 | 35 | 56
| | 0 | 1 | 4 | 9 | 1 | 5 | 15 | 35
| | 0 | 1 | 4 | 27 | 16 | 1 | 6
| | 0 | 1 | 1 | 27 | 96 | 25
| | 0 | 1 | 8 | 81 | 256
| | 0 | 1 | 16 | 81
| | 0 | 1 | 32
| | 0 | 1
| | 0
|
A221857 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10
| | | | 0 | 1 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36
| | | | | 0 | 1 | 4 | 1 | 4 | 10 | 20 | 35 | 56
| | | | | | 0 | 1 | 4 | 9 | 1 | 5 | 15 | 35
| | | | | | | 0 | 1 | 4 | 27 | 16 | 1 | 6
| | | | | | | | 0 | 1 | 1 | 27 | 96 | 25
| | | | | | | | | 0 | 1 | 8 | 81 | 256
| | | | | | | | | | 0 | 1 | 16 | 81
| | | | | | | | | | | 0 | 1 | 32
| | | | | | | | | | | | 0 | 1
| | | | | | | | | | | | | 0
|
|
