A157221 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 |
| | 1 | | 502 | | 126781020 | | 1103881308184906 | | 113909683214485984529600 | | 1103881308184906 | | 126781020 | | 502 | | 1 |
|
A157221 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 11 | 26 | 57 | 120 | 247 | 502
| | 1 | 11 | 14608 | 152637 | 1479726 | 13824739 | 126781020
| | 1 | 26 | 152637 | 251732291184 | 16871482830550 | 1103881308184906
| | 1 | 57 | 1479726 | 16871482830550 | 113909683214485984529600
| | 1 | 120 | 13824739 | 1103881308184906
| | 1 | 247 | 126781020
| | 1 | 502
| | 1
|
A157221 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 11 | 26 | 57 | 120 | 247 | 502
| | | 1 | 11 | 14608 | 152637 | 1479726 | 13824739 | 126781020
| | | | 1 | 26 | 152637 | 251732291184 | 16871482830550 | 1103881308184906
| | | | | 1 | 57 | 1479726 | 16871482830550 | 113909683214485984529600
| | | | | | 1 | 120 | 13824739 | 1103881308184906
| | | | | | | 1 | 247 | 126781020
| | | | | | | | 1 | 502
| | | | | | | | | 1
|
|
