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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 127 |
| 4 | 2769 |
| 5 | 80861 |
| 6 | 2976733 |
| 7 | 132394011 |
| 8 | 6909143265 |
| 9 | 414041227417 |
| 10 | 28025981914581 |
| 11 | 2115049310887679 |
| 12 | 176095675272002929 |
| 13 | 16035108243371426613 |
| 14 | 1585349332849711046829 |
| 15 | 169128107565128349122851 |
| 16 | 19365426435579375683158977 |
| 17 | 2368882573995841615546652081 |
[1,1,9,127,2769,80861,2976733,132394011, 6909143265,414041227417,28025981914581, 2115049310887679,176095675272002929, 16035108243371426613,1585349332849711046829, 169128107565128349122851, 19365426435579375683158977, 2368882573995841615546652081] |