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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 297 |
| 4 | 16281 |
| 5 | 1248777 |
| 6 | 123125913 |
| 7 | 14836317129 |
| 8 | 2112675966297 |
| 9 | 347116504354569 |
| 10 | 64634936370634521 |
| 11 | 13451125114945088073 |
| 12 | 3093938638419767225049 |
| 13 | 779418017792495272404873 |
| 14 | 213421992338103533527717017 |
| 15 | 63114617040470440017309335241 |
| 16 | 20047195073135198062149574564953 |
[1,9,297,16281,1248777,123125913,14836317129, 2112675966297,347116504354569,64634936370634521, 13451125114945088073,3093938638419767225049, 779418017792495272404873, 213421992338103533527717017, 63114617040470440017309335241, 20047195073135198062149574564953] |