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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 181 |
| 4 | 3539 |
| 5 | 81901 |
| 6 | 2203319 |
| 7 | 67741129 |
| 8 | 2346167879 |
| 9 | 90449857081 |
| 10 | 3843107102339 |
| 11 | 178468044946621 |
| 12 | 8994348275804891 |
| 13 | 488964835817842021 |
| 14 | 28523735794360301039 |
| 15 | 1777328098986754744081 |
| 16 | 117817961601577138782479 |
| 17 | 8279178465722546926265329 |
[-1,1,11,181,3539,81901,2203319,67741129, 2346167879,90449857081,3843107102339, 178468044946621,8994348275804891, 488964835817842021,28523735794360301039, 1777328098986754744081,117817961601577138782479, 8279178465722546926265329] |