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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 93 |
| 5 | 1265 |
| 6 | 33380 |
| 7 | 1459806 |
| 8 | 110043463 |
| 9 | 14254922771 |
| 10 | 3155289459645 |
| 11 | 1195938340938067 |
| 12 | 776257336467287589 |
[1,4,14,93,1265,33380,1459806,110043463, 14254922771,3155289459645,1195938340938067, 776257336467287589] |