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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 154 |
| 4 | 2701 |
| 5 | 63216 |
| 6 | 1856569 |
| 7 | 65711024 |
| 8 | 2724349401 |
| 9 | 129552751360 |
| 10 | 6952877604421 |
| 11 | 415770771875328 |
| 12 | 27416031835737637 |
| 13 | 1976460653044957184 |
| 14 | 154658036515292528625 |
| 15 | 13055394531339601033216 |
| 16 | 1182611605875201470044081 |
| 17 | 114426900236922150187892736 |
[1,2,13,154,2701,63216,1856569,65711024, 2724349401,129552751360,6952877604421, 415770771875328,27416031835737637, 1976460653044957184,154658036515292528625, 13055394531339601033216,1182611605875201470044081, 114426900236922150187892736] |