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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 122 |
| 4 | 32242 |
| 5 | 85808250 |
| 6 | 2130201408474 |
| 7 | 487143290951349930 |
| 8 | 1021074261736069185881850 |
| 9 | 19547957495950654924427730234138 |
| 10 | 3408841202663503254998708590894515413082 |
[1,2,6,122,32242,85808250,2130201408474, 487143290951349930,1021074261736069185881850, 19547957495950654924427730234138, 3408841202663503254998708590894515413082] |