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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 1030 |
| 5 | 10009593662 |
| 6 | 13957196317 |
| 7 | 55299492770 |
| 8 | 3764656723270 |
[1,2,10,1030,10009593662,13957196317,55299492770, 3764656723270] |