A099509 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | 1 | | 2 | | 1 |
| | | | | | | | | | 1 | | 3 | | 3 | | 2 |
| | | | | | | | | 1 | | 4 | | 6 | | 7 | | 1 |
| | | | | | | | 1 | | 5 | | 10 | | 16 | | 6 | | 3 |
| | | | | | | 1 | | 6 | | 15 | | 30 | | 19 | | 16 | | 1 |
| | | | | | 1 | | 7 | | 21 | | 50 | | 45 | | 51 | | 10 | | 4 |
| | | | | 1 | | 8 | | 28 | | 77 | | 90 | | 126 | | 45 | | 30 | | 1 |
| | | | 1 | | 9 | | 36 | | 112 | | 161 | | 266 | | 141 | | 126 | | 15 | | 5 |
| | | 1 | | 10 | | 45 | | 156 | | 266 | | 504 | | 357 | | 393 | | 90 | | 50 | | 1 |
| | 1 | | 11 | | 55 | | 210 | | 414 | | 882 | | 784 | | 1016 | | 357 |
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A099509 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11
| 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| 2 | 7 | 16 | 30 | 50 | 77 | 112 | 156 | 210
| 1 | 6 | 19 | 45 | 90 | 161 | 266 | 414
| 3 | 16 | 51 | 126 | 266 | 504 | 882
| 1 | 10 | 45 | 141 | 357 | 784
| 4 | 30 | 126 | 393 | 1016
| 1 | 15 | 90 | 357
| 5 | 50
| 1
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A099509 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11
| | | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| | | | 2 | 7 | 16 | 30 | 50 | 77 | 112 | 156 | 210
| | | | | 1 | 6 | 19 | 45 | 90 | 161 | 266 | 414
| | | | | | 3 | 16 | 51 | 126 | 266 | 504 | 882
| | | | | | | 1 | 10 | 45 | 141 | 357 | 784
| | | | | | | | 4 | 30 | 126 | 393 | 1016
| | | | | | | | | 1 | 15 | 90 | 357
| | | | | | | | | | 5 | 50
| | | | | | | | | | | 1
| | | | | | | | | | |
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