A181937 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | 1 | | 1 | | 1 |
| | | | | | | | | | 1 | | 1 | | 1 | | 2 |
| | | | | | | | | 1 | | 1 | | 1 | | 1 | | 5 |
| | | | | | | | 1 | | 1 | | 1 | | 1 | | 3 | | 16 |
| | | | | | | 1 | | 1 | | 1 | | 1 | | 1 | | 9 | | 61 |
| | | | | | 1 | | 1 | | 1 | | 1 | | 1 | | 4 | | 19 | | 272 |
| | | | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 14 | | 99 | | 1385 |
| | | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 5 | | 34 | | 477 | | 7936 |
| | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 20 | | 69 | | 1513 | | 50521 |
| | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 1 | | 6 | | 55 | | 496 | | 11259 | | 353792 |
|
A181937 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 | 1
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 5 | 3 | 1 | 1 | 1 | 1 | 1 | 1
| 16 | 9 | 4 | 1 | 1 | 1 | 1
| 61 | 19 | 14 | 5 | 1 | 1
| 272 | 99 | 34 | 20 | 6
| 1385 | 477 | 69 | 55
| 7936 | 1513 | 496
| 50521 | 11259
| 353792
|
A181937 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 | 1
| | | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | | | 5 | 3 | 1 | 1 | 1 | 1 | 1 | 1
| | | | | | 16 | 9 | 4 | 1 | 1 | 1 | 1
| | | | | | | 61 | 19 | 14 | 5 | 1 | 1
| | | | | | | | 272 | 99 | 34 | 20 | 6
| | | | | | | | | 1385 | 477 | 69 | 55
| | | | | | | | | | 7936 | 1513 | 496
| | | | | | | | | | | 50521 | 11259
| | | | | | | | | | | | 353792
|
|