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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 27 |
| 4 | 203 |
| 5 | 2002 |
| 6 | 24429 |
| 7 | 353300 |
| 8 | 5877619 |
| 9 | 110140398 |
| 10 | 2289730547 |
| 11 | 52215711142 |
| 12 | 1294830014579 |
| 13 | 34674182292270 |
| 14 | 997028749972868 |
| 15 | 30635875305295776 |
| 16 | 1001785692746640031 |
| 17 | 34734713374858593257 |
[1,1,5,27,203,2002,24429,353300,5877619,110140398, 2289730547,52215711142,1294830014579, 34674182292270,997028749972868,30635875305295776, 1001785692746640031,34734713374858593257] |