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| n | a(n) |
|---|---|
| 2 | 47 |
| 3 | 251 |
| 4 | 1361 |
| 5 | 7817 |
| 6 | 46877 |
| 7 | 280591 |
| 8 | 1680131 |
| 9 | 10077959 |
| 10 | 60470441 |
| 11 | 362797949 |
| 12 | 2176786421 |
| 13 | 13060695047 |
| 14 | 78364167257 |
| 15 | 470184984721 |
| 16 | 2821109908277 |
| 17 | 16926659446819 |
| 18 | 101559956670517 |
| 19 | 609359740010929 |
| 20 | 3656158440066719 |
| 21 | 21936950640380099 |
| 22 | 131621703842267647 |
| 23 | 789730223053605439 |
[47,251,1361,7817,46877,280591,1680131,10077959, 60470441,362797949,2176786421,13060695047, 78364167257,470184984721,2821109908277, 16926659446819,101559956670517,609359740010929, 3656158440066719,21936950640380099, 131621703842267647,789730223053605439] |