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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 2322 |
| 3 | 1234116 |
| 4 | 430292646 |
| 5 | 197681749128 |
| 6 | 86165040337452 |
| 7 | 40145493017336976 |
| 8 | 18768723217958523222 |
| 9 | 8975036477140737601806 |
| 10 | 4331009172188712335053032 |
| 11 | 2113419430011730408087143924 |
| 12 | 1039122180212218474089489166980 |
[1,18,2322,1234116,430292646,197681749128, 86165040337452,40145493017336976, 18768723217958523222,8975036477140737601806, 4331009172188712335053032, 2113419430011730408087143924, 1039122180212218474089489166980] |