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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 330 |
| 5 | 10166 |
| 6 | 12075690 |
| 7 | 1174153011328084322 |
| 8 | 73582975079922326904310062621361286633125176265747127754 |
[1,2,6,14,330,10166,12075690,1174153011328084322, 73582975079922326904310062621361286633125176265747\ 127754] |