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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 378 |
| 5 | 3136 |
| 6 | 27363 |
| 7 | 247597 |
| 8 | 2302511 |
| 9 | 21872361 |
| 10 | 211336755 |
| 11 | 2070577285 |
| 12 | 20522662832 |
| 13 | 205411356794 |
| 14 | 2073258075175 |
| 15 | 21078157565623 |
| 16 | 215658366319375 |
| 17 | 2218853063356937 |
| 18 | 22942886758494094 |
| 19 | 238284942878492146 |
| 20 | 2484736162773443446 |
[1,1,7,49,378,3136,27363,247597,2302511,21872361, 211336755,2070577285,20522662832,205411356794, 2073258075175,21078157565623,215658366319375, 2218853063356937,22942886758494094, 238284942878492146,2484736162773443446] |