A055883 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 2 | | 4 | | 2 |
| | | | | | | | 5 | | 15 | | 15 | | 5 |
| | | | | | | 15 | | 60 | | 90 | | 60 | | 15 |
| | | | | | 52 | | 260 | | 520 | | 520 | | 260 | | 52 |
| | | | | 203 | | 1218 | | 3045 | | 4060 | | 3045 | | 1218 | | 203 |
| | | | 877 | | 6139 | | 18417 | | 30695 | | 30695 | | 18417 | | 6139 | | 877 |
| | | 4140 | | 33120 | | 115920 | | 231840 | | 289800 | | 231840 | | 115920 | | 33120 | | 4140 |
| | 21147 |
|
A055883 as a square array
1 | 1 | 2 | 5 | 15 | 52 | 203 | 877 | 4140 | 21147
| 1 | 4 | 15 | 60 | 260 | 1218 | 6139 | 33120
| 2 | 15 | 90 | 520 | 3045 | 18417 | 115920
| 5 | 60 | 520 | 4060 | 30695 | 231840
| 15 | 260 | 3045 | 30695 | 289800
| 52 | 1218 | 18417 | 231840
| 203 | 6139 | 115920
| 877 | 33120
| 4140
|
A055883 as an upper right triangle
1 | 1 | 2 | 5 | 15 | 52 | 203 | 877 | 4140 | 21147
| | 1 | 4 | 15 | 60 | 260 | 1218 | 6139 | 33120
| | | 2 | 15 | 90 | 520 | 3045 | 18417 | 115920
| | | | 5 | 60 | 520 | 4060 | 30695 | 231840
| | | | | 15 | 260 | 3045 | 30695 | 289800
| | | | | | 52 | 1218 | 18417 | 231840
| | | | | | | 203 | 6139 | 115920
| | | | | | | | 877 | 33120
| | | | | | | | | 4140
| | | | | | | | |
|
|