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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 21 |
| 5 | 2002 |
| 6 | 48594 |
| 7 | 6786340869 |
| 8 | 60683548875931642773982870 |
| 9 | 148748699073930002409397035 |
| 10 | 98235230940726955523493708384725766221632599616516980478369143134298250712431827891413914221729825 |
[1,2,6,21,2002,48594,6786340869, 60683548875931642773982870, 148748699073930002409397035, 98235230940726955523493708384725766221632599616516\ 980478369143134298250712431827891413914221729825] |