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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 100 |
| 3 | 920 |
| 4 | 8986 |
| 5 | 77000 |
| 6 | 690652 |
| 7 | 5752280 |
| 8 | 48916087 |
| 9 | 401709720 |
| 10 | 3324377084 |
| 11 | 26996501992 |
| 12 | 220265771738 |
| 13 | 1777445952616 |
| 14 | 14377907329724 |
| 15 | 115613187110872 |
| 16 | 930725344479074 |
| 17 | 7467529999843432 |
| 18 | 59954521406306500 |
| 19 | 480433200037686456 |
| 20 | 3851244156978563566 |
[1,8,100,920,8986,77000,690652,5752280,48916087, 401709720,3324377084,26996501992,220265771738, 1777445952616,14377907329724,115613187110872, 930725344479074,7467529999843432, 59954521406306500,480433200037686456, 3851244156978563566] |