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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 178 |
| 4 | 5990 |
| 5 | 435801 |
| 6 | 66593821 |
| 7 | 20997402098 |
| 8 | 13512727916532 |
| 9 | 17629371074833300 |
| 10 | 46432767742317108086 |
| 11 | 246240366959004185679198 |
| 12 | 2624854986865673643625591411 |
| 13 | 56179604057909797695704800461149 |
[1,2,12,178,5990,435801,66593821,20997402098, 13512727916532,17629371074833300, 46432767742317108086,246240366959004185679198, 2624854986865673643625591411, 56179604057909797695704800461149] |