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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 197 |
| 5 | 6139 |
| 6 | 603933 |
| 7 | 199410617 |
[1,1,3,14,197,6139,603933,199410617] |