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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 7 |
| 2 | 23 |
| 3 | 113 |
| 4 | 523 |
| 5 | 1327 |
| 6 | 31397 |
| 7 | 1357201 |
| 8 | 436273009 |
| 9 | 304599508537 |
| 10 | 1693182318746371 |
[3,7,23,113,523,1327,31397,1357201,436273009, 304599508537,1693182318746371] |