A081581 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 8 | | 1 |
| | | | | | | | | 1 | | 15 | | 15 | | 1 |
| | | | | | | | 1 | | 22 | | 78 | | 22 | | 1 |
| | | | | | | 1 | | 29 | | 190 | | 190 | | 29 | | 1 |
| | | | | | 1 | | 36 | | 351 | | 848 | | 351 | | 36 | | 1 |
| | | | | 1 | | 43 | | 561 | | 2339 | | 2339 | | 561 | | 43 | | 1 |
| | | | 1 | | 50 | | 820 | | 5006 | | 9766 | | 5006 | | 820 | | 50 | | 1 |
| | | 1 | | 57 | | 1128 | | 9192 | | 28806 | | 28806 | | 9192 | | 1128 | | 57 | | 1 |
| | 1 | | 64 | | 1485 | | 15240 | | 68034 | | 116208 | | 68034 | | 15240 | | 1485 | | 64 | | 1 |
|
A081581 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 8 | 15 | 22 | 29 | 36 | 43 | 50 | 57 | 64
| | 1 | 15 | 78 | 190 | 351 | 561 | 820 | 1128 | 1485
| | 1 | 22 | 190 | 848 | 2339 | 5006 | 9192 | 15240
| | 1 | 29 | 351 | 2339 | 9766 | 28806 | 68034
| | 1 | 36 | 561 | 5006 | 28806 | 116208
| | 1 | 43 | 820 | 9192 | 68034
| | 1 | 50 | 1128 | 15240
| | 1 | 57 | 1485
| | 1 | 64
| | 1
|
A081581 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 8 | 15 | 22 | 29 | 36 | 43 | 50 | 57 | 64
| | | 1 | 15 | 78 | 190 | 351 | 561 | 820 | 1128 | 1485
| | | | 1 | 22 | 190 | 848 | 2339 | 5006 | 9192 | 15240
| | | | | 1 | 29 | 351 | 2339 | 9766 | 28806 | 68034
| | | | | | 1 | 36 | 561 | 5006 | 28806 | 116208
| | | | | | | 1 | 43 | 820 | 9192 | 68034
| | | | | | | | 1 | 50 | 1128 | 15240
| | | | | | | | | 1 | 57 | 1485
| | | | | | | | | | 1 | 64
| | | | | | | | | | | 1
|
|
