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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 40 |
| 3 | 159 |
| 4 | 1653 |
| 5 | 15861 |
| 6 | 154497 |
| 7 | 1550025 |
| 8 | 15500146 |
| 9 | 156403068 |
| 10 | 1575130287 |
| 11 | 15879164337 |
| 12 | 160094331582 |
| 13 | 1614106468648 |
| 14 | 16274791403276 |
| 15 | 164095092614649 |
| 16 | 1654549200516363 |
| 17 | 16682617880390335 |
| 18 | 168208868840066182 |
[1,40,159,1653,15861,154497,1550025,15500146, 156403068,1575130287,15879164337,160094331582, 1614106468648,16274791403276,164095092614649, 1654549200516363,16682617880390335, 168208868840066182] |