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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 50 |
| 3 | 522 |
| 4 | 6498 |
| 5 | 93666 |
| 6 | 1532970 |
| 7 | 28079082 |
| 8 | 569212578 |
| 9 | 12655466946 |
| 10 | 306280630890 |
| 11 | 8017054975242 |
| 12 | 225716319717858 |
| 13 | 6802519195684386 |
| 14 | 218521006115328810 |
| 15 | 7454198349649868202 |
| 16 | 269114811307118424738 |
[1,6,50,522,6498,93666,1532970,28079082,569212578, 12655466946,306280630890,8017054975242, 225716319717858,6802519195684386, 218521006115328810,7454198349649868202, 269114811307118424738] |