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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 35 |
| 4 | 340 |
| 5 | 3304 |
| 6 | 33740 |
| 7 | 367884 |
| 8 | 4302216 |
| 9 | 53961336 |
| 10 | 724534272 |
| 11 | 10386470016 |
| 12 | 158507316864 |
| 13 | 2567670088320 |
| 14 | 44027031755520 |
| 15 | 796963357981440 |
| 16 | 15192135816261120 |
| 17 | 304269507433658880 |
| 18 | 6388907821376256000 |
[3,35,340,3304,33740,367884,4302216,53961336, 724534272,10386470016,158507316864,2567670088320, 44027031755520,796963357981440,15192135816261120, 304269507433658880,6388907821376256000] |