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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 73 |
| 4 | 689 |
| 5 | 8401 |
| 6 | 125425 |
| 7 | 2214801 |
| 8 | 45143873 |
| 9 | 1043046721 |
| 10 | 26937424601 |
| 11 | 768945795289 |
| 12 | 24041093493169 |
| 13 | 817012858376625 |
| 14 | 29986640798644769 |
| 15 | 1182114430632237601 |
| 16 | 49814113380273715457 |
| 17 | 2234572751614363400449 |
| 18 | 106313261857649938064809 |
[3,11,73,689,8401,125425,2214801,45143873, 1043046721,26937424601,768945795289, 24041093493169,817012858376625,29986640798644769, 1182114430632237601,49814113380273715457, 2234572751614363400449,106313261857649938064809] |