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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 9 |
| 3 | 131 |
| 4 | 1396 |
| 5 | 13786 |
| 6 | 131537 |
| 7 | 1239745 |
| 8 | 11665803 |
| 9 | 109941002 |
| 10 | 1038723932 |
| 11 | 9841935529 |
| 12 | 93518105160 |
| 13 | 891022511814 |
| 14 | 8510960557278 |
| 15 | 81485246876212 |
| 16 | 781818951793344 |
[0,-1,9,131,1396,13786,131537,1239745,11665803, 109941002,1038723932,9841935529,93518105160, 891022511814,8510960557278,81485246876212, 781818951793344] |