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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 145 |
| 4 | 57721 |
| 5 | 41855199 |
| 6 | 569620472894 |
| 7 | 7361174970568815 |
| 8 | 1484662166072017164173 |
| 9 | 589336120060277543986621142 |
[1,1,145,57721,41855199,569620472894, 7361174970568815,1484662166072017164173, 589336120060277543986621142] |