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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 61 |
| 5 | 800 |
| 6 | 38194 |
| 7 | 6254652 |
| 8 | 3666019207 |
| 9 | 7400038427299 |
| 10 | 51429702889968135 |
| 11 | 1241437835049586937641 |
| 12 | 105176323921573775380216377 |
| 13 | 31585284922954071317319026074538 |
[1,1,3,8,61,800,38194,6254652,3666019207, 7400038427299,51429702889968135, 1241437835049586937641, 105176323921573775380216377, 31585284922954071317319026074538] |