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| n | a(n) |
|---|---|
| 0 | 6 |
| 1 | 39 |
| 2 | 270 |
| 3 | 1887 |
| 4 | 13206 |
| 5 | 92439 |
| 6 | 647070 |
| 7 | 4529487 |
| 8 | 31706406 |
| 9 | 221944839 |
| 10 | 1553613870 |
| 11 | 10875297087 |
| 12 | 76127079606 |
| 13 | 532889557239 |
| 14 | 3730226900670 |
| 15 | 26111588304687 |
| 16 | 182781118132806 |
| 17 | 1279467826929639 |
| 18 | 8956274788507470 |
| 19 | 62693923519552287 |
[6,39,270,1887,13206,92439,647070,4529487, 31706406,221944839,1553613870,10875297087, 76127079606,532889557239,3730226900670, 26111588304687,182781118132806,1279467826929639, 8956274788507470,62693923519552287] |