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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 11 |
| 2 | 61 |
| 3 | 341 |
| 4 | 1921 |
| 5 | 10901 |
| 6 | 62281 |
| 7 | 358061 |
| 8 | 2070241 |
| 9 | 12030821 |
| 10 | 70231801 |
| 11 | 411625181 |
| 12 | 2420922961 |
| 13 | 14281397141 |
| 14 | 84467679721 |
| 15 | 500702562701 |
| 16 | 2973697798081 |
| 17 | 17689598897861 |
| 18 | 105374653934041 |
| 19 | 628433226338621 |
[2,11,61,341,1921,10901,62281,358061,2070241, 12030821,70231801,411625181,2420922961, 14281397141,84467679721,500702562701, 2973697798081,17689598897861,105374653934041, 628433226338621] |