A209555 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | 2 | | 2 | | 1 |
| | | | | | | | | | 2 | | 5 | | 3 | | 1 |
| | | | | | | | | 3 | | 6 | | 9 | | 4 | | 1 |
| | | | | | | | 3 | | 11 | | 13 | | 14 | | 5 | | 1 |
| | | | | | | 4 | | 12 | | 28 | | 24 | | 20 | | 6 | | 1 |
| | | | | | 4 | | 19 | | 34 | | 59 | | 40 | | 27 | | 7 | | 1 |
| | | | | 5 | | 20 | | 62 | | 80 | | 110 | | 62 | | 35 | | 8 | | 1 |
| | | | 5 | | 29 | | 70 | | 164 | | 166 | | 188 | | 91 | | 44 | | 9 | | 1 |
| | | 6 | | 30 | | 115 | | 200 | | 376 | | 314 | | 301 | | 128 | | 54 | | 10 | | 1 |
| | 6 | | 41 | | 125 | | 365 | | 496 | | 776 |
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A209555 as a square array
1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6
| 1 | 2 | 5 | 6 | 11 | 12 | 19 | 20 | 29 | 30 | 41
| 1 | 3 | 9 | 13 | 28 | 34 | 62 | 70 | 115 | 125
| 1 | 4 | 14 | 24 | 59 | 80 | 164 | 200 | 365
| 1 | 5 | 20 | 40 | 110 | 166 | 376 | 496
| 1 | 6 | 27 | 62 | 188 | 314 | 776
| 1 | 7 | 35 | 91 | 301
| 1 | 8 | 44 | 128
| 1 | 9 | 54
| 1 | 10
| 1
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A209555 as an upper right triangle
1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6
| | 1 | 2 | 5 | 6 | 11 | 12 | 19 | 20 | 29 | 30 | 41
| | | 1 | 3 | 9 | 13 | 28 | 34 | 62 | 70 | 115 | 125
| | | | 1 | 4 | 14 | 24 | 59 | 80 | 164 | 200 | 365
| | | | | 1 | 5 | 20 | 40 | 110 | 166 | 376 | 496
| | | | | | 1 | 6 | 27 | 62 | 188 | 314 | 776
| | | | | | | 1 | 7 | 35 | 91 | 301
| | | | | | | | 1 | 8 | 44 | 128
| | | | | | | | | 1 | 9 | 54
| | | | | | | | | | 1 | 10
| | | | | | | | | | | 1
| | | | | | | | | | |
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