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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 10 |
| 5 | 16 |
| 6 | 52 |
| 7 | 1176 |
| 8 | 687378 |
| 9 | 236241851626 |
| 10 | 2197451321740962081109754668237130 |
| 11 | 2414396155710550624720051944524837499100253655538086242554948251375 |
[1,3,6,10,16,52,1176,687378,236241851626, 2197451321740962081109754668237130, 24143961557105506247200519445248374991002536555380\ 86242554948251375] |