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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 105 |
| 3 | 455 |
| 4 | 1365 |
| 5 | 3003 |
| 6 | 5005 |
| 7 | 6435 |
| 8 | 6435 |
| 9 | 5005 |
| 10 | 3003 |
| 11 | 1365 |
| 12 | 455 |
| 13 | 105 |
| 14 | 15 |
| 15 | 1 |
[1,15,105,455,1365,3003,5005,6435,6435,5005,3003, 1365,455,105,15,1] |