A131398 formatted as a triangular array:
| | | | | | | | | 1 | | | | | | | | | |
| | | | | | | | 1 | | 1 | | | | | | | | |
| | | | | | | 2 | | 4 | | 1 | | | | | | | |
| | | | | | 2 | | 8 | | 7 | | 1 | | | | | | |
| | | | | 2 | | 11 | | 17 | | 10 | | 1 | | | | | |
| | | | 2 | | 14 | | 29 | | 29 | | 13 | | 1 | | | | |
| | | 2 | | 17 | | 44 | | 59 | | 44 | | 16 | | 1 | | | |
| | 2 | | 20 | | 62 | | 104 | | 104 | | 62 | | 19 | | 1 | | |
| 2 | | 23 | | 83 | | 167 | | 209 | | 167 | | 83 | | 22 | | 1 | |
| 2 | | 26 | | 107 | | 251 | | 377 | | 377 | | 251 | | 107 | | 25 | | 1 |
A131398 formatted as a square array:
| 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 1 | 4 | 8 | 11 | 14 | 17 | 20 | 23 | 26 | |
| 1 | 7 | 17 | 29 | 44 | 62 | 83 | 107 | | |
| 1 | 10 | 29 | 59 | 104 | 167 | 251 | | | |
| 1 | 13 | 44 | 104 | 209 | 377 | | | | |
| 1 | 16 | 62 | 167 | 377 | | | | | |
| 1 | 19 | 83 | 251 | | | | | | |
| 1 | 22 | 107 | | | | | | | |
| 1 | 25 | | | | | | | | |
| 1 | | | | | | | | | |
A131398 formatted as an upper right triangle:
| 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 1 | 4 | 8 | 11 | 14 | 17 | 20 | 23 | 26 |
| | 1 | 7 | 17 | 29 | 44 | 62 | 83 | 107 |
| | | 1 | 10 | 29 | 59 | 104 | 167 | 251 |
| | | | 1 | 13 | 44 | 104 | 209 | 377 |
| | | | | 1 | 16 | 62 | 167 | 377 |
| | | | | | 1 | 19 | 83 | 251 |
| | | | | | | 1 | 22 | 107 |
| | | | | | | | 1 | 25 |
| | | | | | | | | 1 |
|