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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 17 |
| 4 | 210 |
| 5 | 9217 |
| 6 | 1399298 |
| 7 | 811229225 |
| 8 | 2071392232962 |
| 9 | 20710319937493889 |
| 10 | 1137259214532706572162 |
| 11 | 255141201504146525745627265 |
| 12 | 348787971214016591166179037803522 |
| 13 | 2262996819897931095524655885144485185409 |
[1,2,4,17,210,9217,1399298,811229225, 2071392232962,20710319937493889, 1137259214532706572162, 255141201504146525745627265, 348787971214016591166179037803522, 2262996819897931095524655885144485185409] |