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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 9 |
| 3 | 24 |
| 4 | 81 |
| 5 | 358 |
| 6 | 2021 |
| 7 | 13828 |
| 8 | 109857 |
| 9 | 986922 |
| 10 | 9865125 |
| 11 | 108507160 |
| 12 | 1302065441 |
| 13 | 16926805678 |
| 14 | 236975181189 |
| 15 | 3554627504844 |
| 16 | 56874039618753 |
| 17 | 966858672535762 |
| 18 | 17403456103546565 |
| 19 | 330665665962928288 |
| 20 | 6613313319249128577 |
[2,4,9,24,81,358,2021,13828,109857,986922,9865125, 108507160,1302065441,16926805678,236975181189, 3554627504844,56874039618753,966858672535762, 17403456103546565,330665665962928288, 6613313319249128577] |