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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 12 |
| 4 | 61 |
| 5 | 310 |
| 6 | 1821 |
| 7 | 11592 |
| 8 | 80963 |
| 9 | 608832 |
| 10 | 4910785 |
| 11 | 42159238 |
| 12 | 383478987 |
| 13 | 3678859158 |
| 14 | 37087880753 |
| 15 | 391641822540 |
| 16 | 4319860660447 |
| 17 | 49647399946048 |
| 18 | 593217470459313 |
| 19 | 7354718987639958 |
| 20 | 94445777492433515 |
| 21 | 1254196823154143190 |
| 22 | 17198114810490326713 |
[3,12,61,310,1821,11592,80963,608832,4910785, 42159238,383478987,3678859158,37087880753, 391641822540,4319860660447,49647399946048, 593217470459313,7354718987639958, 94445777492433515,1254196823154143190, 17198114810490326713] |