A022180 as a triangular array
| | | | | | | | 1 |
| | | | | | | | 1 | | 1 |
| | | | | | | 1 | | 17 | | 1 |
| | | | | | 1 | | 273 | | 273 | | 1 |
| | | | | 1 | | 4369 | | 70161 | | 4369 | | 1 |
| | | | 1 | | 69905 | | 17965585 | | 17965585 | | 69905 | | 1 |
| | | 1 | | 1118481 | | 4599259665 | | 73605001745 | | 4599259665 | | 1118481 | | 1 |
| | 1 | | 17895697 | | 1177411592721 | | 301490686407185 | | 301490686407185 |
|
A022180 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 17 | 273 | 4369 | 69905 | 1118481 | 17895697
| | 1 | 273 | 70161 | 17965585 | 4599259665 | 1177411592721
| | 1 | 4369 | 17965585 | 73605001745 | 301490686407185
| | 1 | 69905 | 4599259665 | 301490686407185
| | 1 | 1118481
| | 1
|
A022180 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 17 | 273 | 4369 | 69905 | 1118481 | 17895697
| | | 1 | 273 | 70161 | 17965585 | 4599259665 | 1177411592721
| | | | 1 | 4369 | 17965585 | 73605001745 | 301490686407185
| | | | | 1 | 69905 | 4599259665 | 301490686407185
| | | | | | 1 | 1118481
| | | | | | | 1
| | | | | | |
|
|
