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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 13 |
| 2 | 305 |
| 3 | 15055 |
| 4 | 1273025 |
| 5 | 164517175 |
| 6 | 30146073425 |
| 7 | 7436961751375 |
| 8 | 2376178127194625 |
| 9 | 954639310366870375 |
| 10 | 470988100516584340625 |
| 11 | 279956419390270100749375 |
| 12 | 197317558974617657009890625 |
[2,13,305,15055,1273025,164517175,30146073425, 7436961751375,2376178127194625,954639310366870375, 470988100516584340625,279956419390270100749375, 197317558974617657009890625] |