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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 163 |
| 4 | 6337 |
| 5 | 375001 |
| 6 | 33862441 |
| 7 | 4150656721 |
| 8 | 677778984961 |
| 9 | 140588337476161 |
| 10 | 36305718780965761 |
| 11 | 11388728893445164801 |
| 12 | 4271349071581227377281 |
| 13 | 1886009588552176549862401 |
| 14 | 968755330019156299208709121 |
| 15 | 572622623006183707899105964801 |
[1,9,163,6337,375001,33862441,4150656721, 677778984961,140588337476161,36305718780965761, 11388728893445164801,4271349071581227377281, 1886009588552176549862401, 968755330019156299208709121, 572622623006183707899105964801] |