A131399 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | 1 | | 6 | | 6 | | 1 |
| | | | | | | 1 | | 9 | | 12 | | 9 | | 1 |
| | | | | | 1 | | 11 | | 23 | | 23 | | 11 | | 1 |
| | | | | 1 | | 14 | | 34 | | 52 | | 34 | | 14 | | 1 |
| | | | 1 | | 16 | | 51 | | 90 | | 90 | | 51 | | 16 | | 1 |
| | | 1 | | 19 | | 67 | | 152 | | 180 | | 152 | | 67 | | 19 | | 1 |
| | 1 | | 21 | | 90 | | 225 | | 342 | | 342 | | 225 | | 90 | | 21 | | 1 |
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A131399 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 6 | 9 | 11 | 14 | 16 | 19 | 21
| | 1 | 6 | 12 | 23 | 34 | 51 | 67 | 90
| | 1 | 9 | 23 | 52 | 90 | 152 | 225
| | 1 | 11 | 34 | 90 | 180 | 342
| | 1 | 14 | 51 | 152 | 342
| | 1 | 16 | 67 | 225
| | 1 | 19 | 90
| | 1 | 21
| | 1
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A131399 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 6 | 9 | 11 | 14 | 16 | 19 | 21
| | | 1 | 6 | 12 | 23 | 34 | 51 | 67 | 90
| | | | 1 | 9 | 23 | 52 | 90 | 152 | 225
| | | | | 1 | 11 | 34 | 90 | 180 | 342
| | | | | | 1 | 14 | 51 | 152 | 342
| | | | | | | 1 | 16 | 67 | 225
| | | | | | | | 1 | 19 | 90
| | | | | | | | | 1 | 21
| | | | | | | | | | 1
|
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