A228900 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 3 | | 1 |
| | | | | | | 1 | | 15 | | 15 | | 1 |
| | | | | | 1 | | 155 | | 484 | | 155 | | 1 |
| | | | | 1 | | 2685 | | 36068 | | 36068 | | 2685 | | 1 |
| | | | 1 | | 65517 | | 5082340 | | 15763254 | | 5082340 | | 65517 | | 1 |
| | | 1 | | 2063205 | | 1179126560 | | 13201421078 | | 13201421078 | | 1179126560 | | 2063205 | | 1 |
| | 1 | | 79715229 | | 411708127954 | | 19954261054442 | | 61092286569334 | | 19954261054442 | | 411708127954 | | 79715229 | | 1 |
|
A228900 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 15 | 155 | 2685 | 65517 | 2063205 | 79715229
| | 1 | 15 | 484 | 36068 | 5082340 | 1179126560 | 411708127954
| | 1 | 155 | 36068 | 15763254 | 13201421078 | 19954261054442
| | 1 | 2685 | 5082340 | 13201421078 | 61092286569334
| | 1 | 65517 | 1179126560 | 19954261054442
| | 1 | 2063205 | 411708127954
| | 1 | 79715229
| | 1
|
A228900 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 15 | 155 | 2685 | 65517 | 2063205 | 79715229
| | | 1 | 15 | 484 | 36068 | 5082340 | 1179126560 | 411708127954
| | | | 1 | 155 | 36068 | 15763254 | 13201421078 | 19954261054442
| | | | | 1 | 2685 | 5082340 | 13201421078 | 61092286569334
| | | | | | 1 | 65517 | 1179126560 | 19954261054442
| | | | | | | 1 | 2063205 | 411708127954
| | | | | | | | 1 | 79715229
| | | | | | | | | 1
|
|
