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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 43 |
| 4 | 410 |
| 5 | 5033 |
| 6 | 75419 |
| 7 | 1334839 |
| 8 | 27249053 |
| 9 | 630249410 |
| 10 | 16288946268 |
| 11 | 465239139606 |
| 12 | 14551915228367 |
| 13 | 494696673952512 |
| 14 | 18161513224841276 |
| 15 | 716102966059713316 |
| 16 | 30181658957863752410 |
| 17 | 1354087807629298185930 |
| 18 | 64430442087414935111822 |
[2,6,43,410,5033,75419,1334839,27249053,630249410, 16288946268,465239139606,14551915228367, 494696673952512,18161513224841276, 716102966059713316,30181658957863752410, 1354087807629298185930,64430442087414935111822] |