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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 20 |
| 5 | 26 |
| 6 | 31 |
| 7 | 483631 |
| 8 | 225372046 |
| 9 | 17570301566444363246 |
| 10 | 17570301566489340929 |
| 11 | 16272673148565174391333181067098727985892644426731405243329 |
[1,2,3,5,20,26,31,483631,225372046, 17570301566444363246,17570301566489340929, 16272673148565174391333181067098727985892644426731\ 405243329] |