A220688 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | 1 | | 12 | | 12 | | 1 |
| | | | | | | 1 | | 37 | | 94 | | 37 | | 1 |
| | | | | | 1 | | 114 | | 745 | | 745 | | 114 | | 1 |
| | | | | 1 | | 351 | | 5851 | | 15452 | | 5851 | | 351 | | 1 |
| | | | 1 | | 1081 | | 46027 | | 312603 | | 312603 | | 46027 | | 1081 | | 1 |
| | | 1 | | 3329 | | 362057 | | 6349886 | | 15978924 | | 6349886 | | 362057 | | 3329 | | 1 |
| | 1 | | 10252 | | 2847943 | | 128995678 |
|
A220688 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 12 | 37 | 114 | 351 | 1081 | 3329 | 10252
| | 1 | 12 | 94 | 745 | 5851 | 46027 | 362057 | 2847943
| | 1 | 37 | 745 | 15452 | 312603 | 6349886 | 128995678
| | 1 | 114 | 5851 | 312603 | 15978924
| | 1 | 351 | 46027 | 6349886
| | 1 | 1081 | 362057
| | 1 | 3329
| | 1
|
A220688 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 12 | 37 | 114 | 351 | 1081 | 3329 | 10252
| | | 1 | 12 | 94 | 745 | 5851 | 46027 | 362057 | 2847943
| | | | 1 | 37 | 745 | 15452 | 312603 | 6349886 | 128995678
| | | | | 1 | 114 | 5851 | 312603 | 15978924
| | | | | | 1 | 351 | 46027 | 6349886
| | | | | | | 1 | 1081 | 362057
| | | | | | | | 1 | 3329
| | | | | | | | | 1
| | | | | | | | |
|
|
