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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 3108 |
| 3 | 297296 |
| 4 | 31937617 |
| 5 | 3350337360 |
| 6 | 353544256465 |
| 7 | 37264079953664 |
| 8 | 3928877032323636 |
| 9 | 414211112701109036 |
| 10 | 43669866502128209569 |
| 11 | 4604058193083952217472 |
| 12 | 485400369515158307543761 |
| 13 | 51175176191003066916312572 |
| 14 | 5395337413785403025694582228 |
[1,20,3108,297296,31937617,3350337360, 353544256465,37264079953664,3928877032323636, 414211112701109036,43669866502128209569, 4604058193083952217472,485400369515158307543761, 51175176191003066916312572, 5395337413785403025694582228] |