A022166 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 1 | | 1 | | | | | | | |
| | | | | | 1 | | 3 | | 1 | | | | | | |
| | | | | 1 | | 7 | | 7 | | 1 | | | | | |
| | | | 1 | | 15 | | 35 | | 15 | | 1 | | | | |
| | | 1 | | 31 | | 155 | | 155 | | 31 | | 1 | | | |
| | 1 | | 63 | | 651 | | 1395 | | 651 | | 63 | | 1 | | |
| 1 | | 127 | | 2667 | | 11811 | | 11811 | | 2667 | | 127 | | 1 | |
| 1 | | 255 | | 10795 | | 97155 | | 200787 | | 97155 | | 10795 | | 255 | | 1 |
A022166 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 | |
| 1 | 7 | 35 | 155 | 651 | 2667 | 10795 | | |
| 1 | 15 | 155 | 1395 | 11811 | 97155 | | | |
| 1 | 31 | 651 | 11811 | 200787 | | | | |
| 1 | 63 | 2667 | 97155 | | | | | |
| 1 | 127 | 10795 | | | | | | |
| 1 | 255 | | | | | | | |
| 1 | | | | | | | | |
A022166 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 |
| | 1 | 7 | 35 | 155 | 651 | 2667 | 10795 |
| | | 1 | 15 | 155 | 1395 | 11811 | 97155 |
| | | | 1 | 31 | 651 | 11811 | 200787 |
| | | | | 1 | 63 | 2667 | 97155 |
| | | | | | 1 | 127 | 10795 |
| | | | | | | 1 | 255 |
| | | | | | | | 1 |
|
