A221919 as a triangular array
| | | | | | | | | | | | 2 |
| | | | | | | | | | | | 3 | | 1 |
| | | | | | | | | | | 4 | | 5 | | 2 |
| | | | | | | | | | 5 | | 3 | | 7 | | 1 |
| | | | | | | | | 6 | | 7 | | 8 | | 9 | | 2 |
| | | | | | | | 7 | | 2 | | 1 | | 5 | | 11 | | 1 |
| | | | | | | 8 | | 9 | | 10 | | 11 | | 12 | | 13 | | 2 |
| | | | | | 9 | | 5 | | 11 | | 3 | | 13 | | 7 | | 15 | | 1 |
| | | | | 10 | | 11 | | 4 | | 13 | | 14 | | 5 | | 16 | | 17 | | 2 |
| | | | 11 | | 3 | | 13 | | 7 | | 3 | | 4 | | 17 | | 9 | | 19 | | 1 |
| | | 12 | | 13 | | 14 | | 15 | | 16 | | 17 | | 18 | | 19 | | 20 | | 21 | | 2 |
| | 13 | | 7 | | 5 | | 1 | | 17 | | 1 | | 19 | | 5 | | 7 | | 11 | | 23 | | 1 |
|
A221919 as a square array
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13
| | 1 | 5 | 3 | 7 | 2 | 9 | 5 | 11 | 3 | 13 | 7
| | 2 | 7 | 8 | 1 | 10 | 11 | 4 | 13 | 14 | 5
| | 1 | 9 | 5 | 11 | 3 | 13 | 7 | 15 | 1
| | 2 | 11 | 12 | 13 | 14 | 3 | 16 | 17
| | 1 | 13 | 7 | 5 | 4 | 17 | 1
| | 2 | 15 | 16 | 17 | 18 | 19
| | 1 | 17 | 9 | 19 | 5
| | 2 | 19 | 20 | 7
| | 1 | 21 | 11
| | 2 | 23
| | 1
|
A221919 as an upper right triangle
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13
| | 1 | 5 | 3 | 7 | 2 | 9 | 5 | 11 | 3 | 13 | 7
| | | 2 | 7 | 8 | 1 | 10 | 11 | 4 | 13 | 14 | 5
| | | | 1 | 9 | 5 | 11 | 3 | 13 | 7 | 15 | 1
| | | | | 2 | 11 | 12 | 13 | 14 | 3 | 16 | 17
| | | | | | 1 | 13 | 7 | 5 | 4 | 17 | 1
| | | | | | | 2 | 15 | 16 | 17 | 18 | 19
| | | | | | | | 1 | 17 | 9 | 19 | 5
| | | | | | | | | 2 | 19 | 20 | 7
| | | | | | | | | | 1 | 21 | 11
| | | | | | | | | | | 2 | 23
| | | | | | | | | | | | 1
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