A261440 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 2 | | 0 |
| | | | | | | | 1 | | 1 | | 3 | | 4 | | 0 |
| | | | | | | 1 | | 1 | | 4 | | 11 | | 9 | | 0 |
| | | | | | 1 | | 1 | | 5 | | 21 | | 46 | | 21 | | 0 |
| | | | | 1 | | 1 | | 6 | | 34 | | 127 | | 207 | | 51 | | 0 |
| | | | 1 | | 1 | | 7 | | 50 | | 268 | | 833 | | 979 | | 127 | | 0 |
| | | 1 | | 1 | | 8 | | 69 | | 485 | | 2299 | | 5763 | | 4797 | | 323 | | 0 |
| | 1 | | 1 | | 9 | | 91 | | 794 | | 5130 | | 20838 | | 41401 | | 24138 | | 835 | | 0 |
|
A261440 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| | 0 | 4 | 11 | 21 | 34 | 50 | 69 | 91
| | 0 | 9 | 46 | 127 | 268 | 485 | 794
| | 0 | 21 | 207 | 833 | 2299 | 5130
| | 0 | 51 | 979 | 5763 | 20838
| | 0 | 127 | 4797 | 41401
| | 0 | 323 | 24138
| | 0 | 835
| | 0
|
A261440 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| | | | 0 | 4 | 11 | 21 | 34 | 50 | 69 | 91
| | | | | 0 | 9 | 46 | 127 | 268 | 485 | 794
| | | | | | 0 | 21 | 207 | 833 | 2299 | 5130
| | | | | | | 0 | 51 | 979 | 5763 | 20838
| | | | | | | | 0 | 127 | 4797 | 41401
| | | | | | | | | 0 | 323 | 24138
| | | | | | | | | | 0 | 835
| | | | | | | | | | | 0
|
|
