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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 8928 |
| 4 | 43260 |
| 5 | 186002 |
| 6 | 684324 |
| 7 | 2367656 |
| 8 | 8000806 |
| 9 | 26057006 |
| 10 | 82907430 |
| 11 | 260627110 |
| 12 | 806084422 |
| 13 | 2476671718 |
| 14 | 7545089216 |
| 15 | 22861190904 |
| 16 | 68993933764 |
| 17 | 207422313718 |
| 18 | 622180142516 |
| 19 | 1862113694818 |
| 20 | 5564560256320 |
| 21 | 16608301418960 |
[42,1764,8928,43260,186002,684324,2367656,8000806, 26057006,82907430,260627110,806084422,2476671718, 7545089216,22861190904,68993933764,207422313718, 622180142516,1862113694818,5564560256320, 16608301418960] |