A220681 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | 1 | | 9 | | 9 | | 1 |
| | | | | | | 1 | | 25 | | 43 | | 25 | | 1 |
| | | | | | 1 | | 64 | | 201 | | 201 | | 64 | | 1 |
| | | | | 1 | | 169 | | 968 | | 2024 | | 968 | | 169 | | 1 |
| | | | 1 | | 441 | | 4604 | | 21380 | | 21380 | | 4604 | | 441 | | 1 |
| | | 1 | | 1156 | | 22000 | | 220299 | | 468036 | | 220299 | | 22000 | | 1156 | | 1 |
| | 1 | | 3025 | | 104976 | | 2316754 | | 9973284 | | 9973284 | | 2316754 |
|
A220681 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 9 | 25 | 64 | 169 | 441 | 1156 | 3025
| | 1 | 9 | 43 | 201 | 968 | 4604 | 22000 | 104976
| | 1 | 25 | 201 | 2024 | 21380 | 220299 | 2316754
| | 1 | 64 | 968 | 21380 | 468036 | 9973284
| | 1 | 169 | 4604 | 220299 | 9973284
| | 1 | 441 | 22000 | 2316754
| | 1 | 1156
| | 1
|
A220681 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 9 | 25 | 64 | 169 | 441 | 1156 | 3025
| | | 1 | 9 | 43 | 201 | 968 | 4604 | 22000 | 104976
| | | | 1 | 25 | 201 | 2024 | 21380 | 220299 | 2316754
| | | | | 1 | 64 | 968 | 21380 | 468036 | 9973284
| | | | | | 1 | 169 | 4604 | 220299 | 9973284
| | | | | | | 1 | 441 | 22000 | 2316754
| | | | | | | | 1 | 1156
| | | | | | | | | 1
| | | | | | | | |
|
|
