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| n | a(n) |
|---|---|
| 1 | 91 |
| 2 | 561 |
| 3 | 3397 |
| 4 | 20495 |
| 5 | 123133 |
| 6 | 738307 |
| 7 | 4420961 |
| 8 | 26449067 |
| 9 | 158114037 |
| 10 | 944443595 |
| 11 | 5635861085 |
| 12 | 33592371427 |
| 13 | 199953831841 |
| 14 | 1188364420259 |
| 15 | 7050730029429 |
| 16 | 41757312808091 |
| 17 | 246836304140925 |
| 18 | 1456269364652499 |
| 19 | 8574736487657897 |
[91,561,3397,20495,123133,738307,4420961,26449067, 158114037,944443595,5635861085,33592371427, 199953831841,1188364420259,7050730029429, 41757312808091,246836304140925,1456269364652499, 8574736487657897] |