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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 73 |
| 4 | 1009 |
| 5 | 17341 |
| 6 | 355951 |
| 7 | 8488117 |
| 8 | 230439553 |
| 9 | 7013527129 |
| 10 | 236419161751 |
| 11 | 8740611892321 |
| 12 | 351566026652017 |
| 13 | 15280473017519893 |
| 14 | 713558666964639679 |
| 15 | 35623071889296787981 |
| 16 | 1893073661362838712961 |
| 17 | 106682309871314293118257 |
[1,1,7,73,1009,17341,355951,8488117,230439553, 7013527129,236419161751,8740611892321, 351566026652017,15280473017519893, 713558666964639679,35623071889296787981, 1893073661362838712961,106682309871314293118257] |