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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 1415 |
| 4 | 69025 |
| 5 | 5403005 |
| 6 | 616437655 |
| 7 | 96365988815 |
| 8 | 19756766836225 |
| 9 | 5140259013390005 |
| 10 | 1654190282113104055 |
| 11 | 645005323804145184215 |
| 12 | 299613583126435893179425 |
| 13 | 163464903833408195554809005 |
[1,5,55,1415,69025,5403005,616437655,96365988815, 19756766836225,5140259013390005, 1654190282113104055,645005323804145184215, 299613583126435893179425, 163464903833408195554809005] |