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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 40 |
| 4 | 431 |
| 5 | 5826 |
| 6 | 94657 |
| 7 | 1795900 |
| 8 | 38963535 |
| 9 | 951398890 |
| 10 | 25819760021 |
| 11 | 770959012704 |
| 12 | 25117397416795 |
| 13 | 886626537549130 |
| 14 | 33708625339151505 |
| 15 | 1373237757290215156 |
| 16 | 59677939242566840303 |
| 17 | 2755753623830236494930 |
| 18 | 134746033233724391374765 |
| 19 | 6954962673986411576581000 |
[0,1,5,40,431,5826,94657,1795900,38963535, 951398890,25819760021,770959012704,25117397416795, 886626537549130,33708625339151505, 1373237757290215156,59677939242566840303, 2755753623830236494930,134746033233724391374765, 6954962673986411576581000] |