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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 21 |
| 3 | 8968 |
| 4 | 28594 |
| 5 | 2059835 |
| 6 | 60501563 |
| 7 | 2899297652 |
| 8 | 133518102376 |
| 9 | 6327934680000 |
| 10 | 307776560940205 |
| 11 | 14923956123066383 |
| 12 | 730433298641263668 |
| 13 | 35734411310196784099 |
| 14 | 1751985608336100700720 |
| 15 | 85921025124831969145232 |
[64,21,8968,28594,2059835,60501563,2899297652, 133518102376,6327934680000,307776560940205, 14923956123066383,730433298641263668, 35734411310196784099,1751985608336100700720, 85921025124831969145232] |