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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 23 |
| 6 | 719 |
| 7 | 5039 |
| 8 | 39916801 |
| 9 | 479001599 |
| 10 | 87178291199 |
| 11 | 10888869450418352160768000001 |
| 12 | 265252859812191058636308479999999 |
| 13 | 263130836933693530167218012159999999 |
| 14 | 8683317618811886495518194401279999999 |
[2,3,5,7,23,719,5039,39916801,479001599, 87178291199,10888869450418352160768000001, 265252859812191058636308479999999, 263130836933693530167218012159999999, 8683317618811886495518194401279999999] |