A157221 formatted as a triangular array:
| | | | | | | 1 | | | | | | | |
| | | | | | 1 | | 1 | | | | | | |
| | | | | 1 | | 4 | | 1 | | | | | |
| | | | 1 | | 11 | | 11 | | 1 | | | | |
| | | 1 | | 26 | | 14608 | | 26 | | 1 | | | |
| | 1 | | 57 | | 152637 | | 152637 | | 57 | | 1 | | |
| 1 | | 120 | | 1479726 | | 251732291184 | | 1479726 | | 120 | | 1 | |
| 1 | | 247 | | 13824739 | | 16871482830550 | | 16871482830550 | | 13824739 | | 247 | | 1 |
A157221 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 4 | 11 | 26 | 57 | 120 | 247 | |
| 1 | 11 | 14608 | 152637 | 1479726 | 13824739 | | |
| 1 | 26 | 152637 | 251732291184 | 16871482830550 | | | |
| 1 | 57 | 1479726 | 16871482830550 | | | | |
| 1 | 120 | 13824739 | | | | | |
| 1 | 247 | | | | | | |
| 1 | | | | | | | |
A157221 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 4 | 11 | 26 | 57 | 120 | 247 |
| | 1 | 11 | 14608 | 152637 | 1479726 | 13824739 |
| | | 1 | 26 | 152637 | 251732291184 | 16871482830550 |
| | | | 1 | 57 | 1479726 | 16871482830550 |
| | | | | 1 | 120 | 13824739 |
| | | | | | 1 | 247 |
| | | | | | | 1 |
|
