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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 71 |
| 4 | 1596 |
| 5 | 58141 |
| 6 | 3109986 |
| 7 | 229395011 |
| 8 | 22312837176 |
| 9 | 2767173538681 |
| 10 | 426167405495166 |
| 11 | 79796244279937151 |
| 12 | 17851790220732115956 |
| 13 | 4702787739658825158421 |
| 14 | 1440911869083478804851546 |
| 15 | 508062238427253843822090491 |
| 16 | 204262590490127231070131373936 |
| 17 | 92884219961086104169154295141361 |
[0,1,6,71,1596,58141,3109986,229395011, 22312837176,2767173538681,426167405495166, 79796244279937151,17851790220732115956, 4702787739658825158421,1440911869083478804851546, 508062238427253843822090491, 204262590490127231070131373936, 92884219961086104169154295141361] |