A168621 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | 1 | | 9 | | 9 | | 1 |
| | | | | | | 1 | | 28 | | 42 | | 28 | | 1 |
| | | | | | 1 | | 125 | | 250 | | 250 | | 125 | | 1 |
| | | | | 1 | | 726 | | 1815 | | 2420 | | 1815 | | 726 | | 1 |
| | | | 1 | | 5047 | | 15141 | | 25235 | | 25235 | | 15141 | | 5047 | | 1 |
| | | 1 | | 40328 | | 141148 | | 282296 | | 352870 | | 282296 | | 141148 | | 40328 | | 1 |
| | 1 | | 362889 | | 1451556 | | 3386964 | | 5080446 | | 5080446 | | 3386964 | | 1451556 | | 362889 | | 1 |
|
A168621 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 9 | 28 | 125 | 726 | 5047 | 40328 | 362889
| | 1 | 9 | 42 | 250 | 1815 | 15141 | 141148 | 1451556
| | 1 | 28 | 250 | 2420 | 25235 | 282296 | 3386964
| | 1 | 125 | 1815 | 25235 | 352870 | 5080446
| | 1 | 726 | 15141 | 282296 | 5080446
| | 1 | 5047 | 141148 | 3386964
| | 1 | 40328 | 1451556
| | 1 | 362889
| | 1
|
A168621 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 9 | 28 | 125 | 726 | 5047 | 40328 | 362889
| | | 1 | 9 | 42 | 250 | 1815 | 15141 | 141148 | 1451556
| | | | 1 | 28 | 250 | 2420 | 25235 | 282296 | 3386964
| | | | | 1 | 125 | 1815 | 25235 | 352870 | 5080446
| | | | | | 1 | 726 | 15141 | 282296 | 5080446
| | | | | | | 1 | 5047 | 141148 | 3386964
| | | | | | | | 1 | 40328 | 1451556
| | | | | | | | | 1 | 362889
| | | | | | | | | | 1
|
|
