A055340 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 0 |
| | | | | | | | | | | 1 | | 1 | | 0 |
| | | | | | | | | | 1 | | 2 | | 1 | | 0 |
| | | | | | | | | 1 | | 4 | | 3 | | 1 | | 0 |
| | | | | | | | 1 | | 6 | | 8 | | 4 | | 1 | | 0 |
| | | | | | | 1 | | 9 | | 19 | | 16 | | 5 | | 1 | | 0 |
| | | | | | 1 | | 12 | | 37 | | 46 | | 25 | | 6 | | 1 | | 0 |
| | | | | 1 | | 16 | | 66 | | 118 | | 96 | | 40 | | 7 | | 1 | | 0 |
| | | | 1 | | 20 | | 110 | | 260 | | 300 | | 184 | | 56 | | 8 | | 1 | | 0 |
| | | 1 | | 25 | | 172 | | 527 | | 811 | | 688 | | 318 | | 80 | | 9 | | 1 | | 0 |
| | 1 | | 30 | | 257 | | 985 | | 1951 | | 2178 | | 1408 | | 524 | | 105 | | 10 | | 1 | | 0 |
|
A055340 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30
| | 0 | 1 | 3 | 8 | 19 | 37 | 66 | 110 | 172 | 257
| | 0 | 1 | 4 | 16 | 46 | 118 | 260 | 527 | 985
| | 0 | 1 | 5 | 25 | 96 | 300 | 811 | 1951
| | 0 | 1 | 6 | 40 | 184 | 688 | 2178
| | 0 | 1 | 7 | 56 | 318 | 1408
| | 0 | 1 | 8 | 80 | 524
| | 0 | 1 | 9 | 105
| | 0 | 1 | 10
| | 0 | 1
| | 0
|
A055340 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30
| | | 0 | 1 | 3 | 8 | 19 | 37 | 66 | 110 | 172 | 257
| | | | 0 | 1 | 4 | 16 | 46 | 118 | 260 | 527 | 985
| | | | | 0 | 1 | 5 | 25 | 96 | 300 | 811 | 1951
| | | | | | 0 | 1 | 6 | 40 | 184 | 688 | 2178
| | | | | | | 0 | 1 | 7 | 56 | 318 | 1408
| | | | | | | | 0 | 1 | 8 | 80 | 524
| | | | | | | | | 0 | 1 | 9 | 105
| | | | | | | | | | 0 | 1 | 10
| | | | | | | | | | | 0 | 1
| | | | | | | | | | | | 0
|
|
