A221787 as a triangular array
| | | | | | | | | | | | 0 |
| | | | | | | | | | | | 0 | | 0 |
| | | | | | | | | | | 0 | | 0 | | 0 |
| | | | | | | | | | 0 | | 1 | | 0 | | 0 |
| | | | | | | | | 0 | | 3 | | 0 | | 0 | | 0 |
| | | | | | | | 0 | | 8 | | 5 | | 1 | | 0 | | 0 |
| | | | | | | 0 | | 21 | | 24 | | 16 | | 0 | | 0 | | 0 |
| | | | | | 0 | | 55 | | 142 | | 173 | | 41 | | 1 | | 0 | | 0 |
| | | | | 0 | | 144 | | 840 | | 1325 | | 744 | | 105 | | 0 | | 0 | | 0 |
| | | | 0 | | 377 | | 4919 | | 15936 | | 13682 | | 4131 | | 288 | | 1 | | 0 | | 0 |
| | | 0 | | 987 | | 28704 | | 187794 | | 252538 | | 109702 | | 19998 | | 735 | | 0 | | 0 | | 0 |
| | 0 | | 2584 | | 167344 |
|
A221787 as a square array
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| 0 | 0 | 1 | 3 | 8 | 21 | 55 | 144 | 377 | 987 | 2584
| 0 | 0 | 0 | 5 | 24 | 142 | 840 | 4919 | 28704 | 167344
| 0 | 0 | 1 | 16 | 173 | 1325 | 15936 | 187794
| 0 | 0 | 0 | 41 | 744 | 13682 | 252538
| 0 | 0 | 1 | 105 | 4131 | 109702
| 0 | 0 | 0 | 288 | 19998
| 0 | 0 | 1 | 735
| 0 | 0 | 0
| 0 | 0
| 0
|
A221787 as an upper right triangle
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | 0 | 0 | 1 | 3 | 8 | 21 | 55 | 144 | 377 | 987 | 2584
| | | 0 | 0 | 0 | 5 | 24 | 142 | 840 | 4919 | 28704 | 167344
| | | | 0 | 0 | 1 | 16 | 173 | 1325 | 15936 | 187794
| | | | | 0 | 0 | 0 | 41 | 744 | 13682 | 252538
| | | | | | 0 | 0 | 1 | 105 | 4131 | 109702
| | | | | | | 0 | 0 | 0 | 288 | 19998
| | | | | | | | 0 | 0 | 1 | 735
| | | | | | | | | 0 | 0 | 0
| | | | | | | | | | 0 | 0
| | | | | | | | | | | 0
| | | | | | | | | | |
|
|