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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 318 |
| 3 | 12542 |
| 4 | 577414 |
| 5 | 25530633 |
| 6 | 1136389329 |
| 7 | 50496693142 |
| 8 | 2244479038934 |
| 9 | 99754529748792 |
| 10 | 4433564852824255 |
| 11 | 197047640578291149 |
| 12 | 8757684228677158709 |
| 13 | 389230724960761808734 |
| 14 | 17299155383196445062953 |
| 15 | 768851839790098893898403 |
[2,318,12542,577414,25530633,1136389329, 50496693142,2244479038934,99754529748792, 4433564852824255,197047640578291149, 8757684228677158709,389230724960761808734, 17299155383196445062953,768851839790098893898403] |