A221898 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 3 | | 3 |
| | | | | | | | 6 | | 31 | | 6 |
| | | | | | | 13 | | 258 | | 266 | | 13 |
| | | | | | 28 | | 2241 | | 7667 | | 2305 | | 28 |
| | | | | 60 | | 19408 | | 236532 | | 235332 | | 19936 | | 60 |
| | | | 129 | | 167960 | | 7235107 | | 25821731 | | 7197649 | | 172624 | | 129 |
| | | 277 | | 1453952 | | 221465158 | | 2815434576 | | 2814706089 | | 220361275 | | 1494152 | | 277 |
| | 595 | | 12585637 |
|
A221898 as a square array
1 | 3 | 6 | 13 | 28 | 60 | 129 | 277 | 595
| 3 | 31 | 258 | 2241 | 19408 | 167960 | 1453952 | 12585637
| 6 | 266 | 7667 | 236532 | 7235107 | 221465158
| 13 | 2305 | 235332 | 25821731 | 2815434576
| 28 | 19936 | 7197649 | 2814706089
| 60 | 172624 | 220361275
| 129 | 1494152
| 277
|
A221898 as an upper right triangle
1 | 3 | 6 | 13 | 28 | 60 | 129 | 277 | 595
| | 3 | 31 | 258 | 2241 | 19408 | 167960 | 1453952 | 12585637
| | | 6 | 266 | 7667 | 236532 | 7235107 | 221465158
| | | | 13 | 2305 | 235332 | 25821731 | 2815434576
| | | | | 28 | 19936 | 7197649 | 2814706089
| | | | | | 60 | 172624 | 220361275
| | | | | | | 129 | 1494152
| | | | | | | | 277
| | | | | | | |
|
|