A055290 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 0 |
| | | | | | | | | | | 1 | | 1 | | 0 |
| | | | | | | | | | 1 | | 1 | | 1 | | 0 |
| | | | | | | | | 1 | | 2 | | 2 | | 1 | | 0 |
| | | | | | | | 1 | | 3 | | 4 | | 2 | | 1 | | 0 |
| | | | | | | 1 | | 4 | | 8 | | 6 | | 3 | | 1 | | 0 |
| | | | | | 1 | | 5 | | 14 | | 14 | | 9 | | 3 | | 1 | | 0 |
| | | | | 1 | | 7 | | 23 | | 32 | | 26 | | 12 | | 4 | | 1 | | 0 |
| | | | 1 | | 8 | | 36 | | 64 | | 66 | | 39 | | 16 | | 4 | | 1 | | 0 |
| | | 1 | | 10 | | 54 | | 123 | | 158 | | 119 | | 60 | | 20 | | 5 | | 1 | | 0 |
| | 1 | | 12 | | 78 | | 219 | | 350 | | 325 | | 202 | | 83 | | 25 | | 5 | | 1 | | 0 |
|
A055290 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 1 | 2 | 3 | 4 | 5 | 7 | 8 | 10 | 12
| | 0 | 1 | 2 | 4 | 8 | 14 | 23 | 36 | 54 | 78
| | 0 | 1 | 2 | 6 | 14 | 32 | 64 | 123 | 219
| | 0 | 1 | 3 | 9 | 26 | 66 | 158 | 350
| | 0 | 1 | 3 | 12 | 39 | 119 | 325
| | 0 | 1 | 4 | 16 | 60 | 202
| | 0 | 1 | 4 | 20 | 83
| | 0 | 1 | 5 | 25
| | 0 | 1 | 5
| | 0 | 1
| | 0
|
A055290 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 1 | 2 | 3 | 4 | 5 | 7 | 8 | 10 | 12
| | | 0 | 1 | 2 | 4 | 8 | 14 | 23 | 36 | 54 | 78
| | | | 0 | 1 | 2 | 6 | 14 | 32 | 64 | 123 | 219
| | | | | 0 | 1 | 3 | 9 | 26 | 66 | 158 | 350
| | | | | | 0 | 1 | 3 | 12 | 39 | 119 | 325
| | | | | | | 0 | 1 | 4 | 16 | 60 | 202
| | | | | | | | 0 | 1 | 4 | 20 | 83
| | | | | | | | | 0 | 1 | 5 | 25
| | | | | | | | | | 0 | 1 | 5
| | | | | | | | | | | 0 | 1
| | | | | | | | | | | | 0
|
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