A209581 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 2 | | 4 | | 1 |
| | | | | | | | | 2 | | 8 | | 11 | | 1 |
| | | | | | | | 3 | | 12 | | 25 | | 26 | | 1 |
| | | | | | | 3 | | 19 | | 51 | | 71 | | 57 | | 1 |
| | | | | | 4 | | 24 | | 88 | | 180 | | 190 | | 120 | | 1 |
| | | | | 4 | | 34 | | 136 | | 348 | | 566 | | 486 | | 247 | | 1 |
| | | | 5 | | 40 | | 206 | | 628 | | 1238 | | 1648 | | 1199 | | 502 | | 1 |
| | | 5 | | 53 | | 282 | | 1034 | | 2526 | | 4070 | | 4545 | | 2873 | | 1013 | | 1 |
| | 6 | | 60 | | 395 | | 1600 | | 4556 | | 9208 |
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A209581 as a square array
| 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6
| | 1 | 4 | 8 | 12 | 19 | 24 | 34 | 40 | 53 | 60
| | 1 | 11 | 25 | 51 | 88 | 136 | 206 | 282 | 395
| | 1 | 26 | 71 | 180 | 348 | 628 | 1034 | 1600
| | 1 | 57 | 190 | 566 | 1238 | 2526 | 4556
| | 1 | 120 | 486 | 1648 | 4070 | 9208
| | 1 | 247 | 1199 | 4545
| | 1 | 502 | 2873
| | 1 | 1013
| | 1
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A209581 as an upper right triangle
| 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6
| | 1 | 4 | 8 | 12 | 19 | 24 | 34 | 40 | 53 | 60
| | | 1 | 11 | 25 | 51 | 88 | 136 | 206 | 282 | 395
| | | | 1 | 26 | 71 | 180 | 348 | 628 | 1034 | 1600
| | | | | 1 | 57 | 190 | 566 | 1238 | 2526 | 4556
| | | | | | 1 | 120 | 486 | 1648 | 4070 | 9208
| | | | | | | 1 | 247 | 1199 | 4545
| | | | | | | | 1 | 502 | 2873
| | | | | | | | | 1 | 1013
| | | | | | | | | | 1
| | | | | | | | | |
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