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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 39 |
| 4 | 242 |
| 5 | 1895 |
| 6 | 19051 |
| 7 | 246895 |
| 8 | 4145108 |
| 9 | 90325655 |
| 10 | 2555630036 |
| 11 | 93810648902 |
| 12 | 4461086120602 |
| 13 | 274339212258846 |
| 14 | 21775814889230580 |
| 15 | 2226876304576948549 |
[1,2,8,39,242,1895,19051,246895,4145108,90325655, 2555630036,93810648902,4461086120602, 274339212258846,21775814889230580, 2226876304576948549] |