A131923 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 2 | | 2 | | | | | | | |
| | | | | | 3 | | 4 | | 3 | | | | | | |
| | | | | 4 | | 6 | | 6 | | 4 | | | | | |
| | | | 5 | | 8 | | 10 | | 8 | | 5 | | | | |
| | | 6 | | 10 | | 15 | | 15 | | 10 | | 6 | | | |
| | 7 | | 12 | | 21 | | 26 | | 21 | | 12 | | 7 | | |
| 8 | | 14 | | 28 | | 42 | | 42 | | 28 | | 14 | | 8 | |
| 9 | | 16 | | 36 | | 64 | | 78 | | 64 | | 36 | | 9 | | 10 |
A131923 formatted as a square array:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | |
| 3 | 6 | 10 | 15 | 21 | 28 | 36 | | |
| 4 | 8 | 15 | 26 | 42 | 64 | | | |
| 5 | 10 | 21 | 42 | 78 | | | | |
| 6 | 12 | 28 | 64 | | | | | |
| 7 | 14 | 36 | | | | | | |
| 8 | 9 | | | | | | | |
| 10 | | | | | | | | |
A131923 formatted as an upper right triangle:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
| | 3 | 6 | 10 | 15 | 21 | 28 | 36 |
| | | 4 | 8 | 15 | 26 | 42 | 64 |
| | | | 5 | 10 | 21 | 42 | 78 |
| | | | | 6 | 12 | 28 | 64 |
| | | | | | 7 | 14 | 36 |
| | | | | | | 8 | 9 |
| | | | | | | | 10 |
|
