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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 627 |
| 4 | 4087968 |
| 5 | 269232701252579 |
| 6 | 1122762851668802145076610697775 |
| 7 | 7635091408773606342884016584406035907659413687778608637732566 |
[1,2,11,627,4087968,269232701252579, 1122762851668802145076610697775, 76350914087736063428840165844060359076594136877786\ 08637732566] |