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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 73 |
| 5 | 241 |
| 6 | 2161 |
| 7 | 15121 |
| 8 | 161281 |
| 9 | 1088641 |
| 10 | 10886401 |
| 11 | 39916801 |
| 12 | 958003201 |
| 13 | 18681062401 |
| 14 | 1133317785601 |
| 15 | 9153720576001 |
| 16 | 83691159552001 |
| 17 | 1778437140480001 |
| 18 | 12804747411456001 |
| 19 | 851515702861824001 |
| 20 | 41359334139002880001 |
| 21 | 766364132575641600001 |
| 22 | 20232013099996938240001 |
[2,3,7,73,241,2161,15121,161281,1088641,10886401, 39916801,958003201,18681062401,1133317785601, 9153720576001,83691159552001,1778437140480001, 12804747411456001,851515702861824001, 41359334139002880001,766364132575641600001, 20232013099996938240001] |