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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 186 |
| 4 | 1181 |
| 5 | 7081 |
| 6 | 73352 |
| 7 | 759243 |
| 8 | 6588378 |
| 9 | 57693478 |
| 10 | 533724767 |
| 11 | 4922696680 |
| 12 | 44623406796 |
| 13 | 405152379143 |
| 14 | 3698469278671 |
| 15 | 33742294413274 |
| 16 | 307321953516448 |
| 17 | 2799705826422060 |
| 18 | 25518781471597350 |
| 19 | 232579566114463247 |
[1,7,186,1181,7081,73352,759243,6588378,57693478, 533724767,4922696680,44623406796,405152379143, 3698469278671,33742294413274,307321953516448, 2799705826422060,25518781471597350, 232579566114463247] |