| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 39 |
| 3 | 207 |
| 4 | 3074 |
| 5 | 26770 |
| 6 | 308070 |
| 7 | 3072428 |
| 8 | 33022374 |
| 9 | 341503872 |
| 10 | 3603418695 |
| 11 | 37628839684 |
| 12 | 395070947793 |
| 13 | 4136321868326 |
| 14 | 43369462014426 |
| 15 | 454388947033525 |
| 16 | 4762556310357090 |
| 17 | 49907461663171892 |
| 18 | 523040952733010374 |
[1,39,207,3074,26770,308070,3072428,33022374, 341503872,3603418695,37628839684,395070947793, 4136321868326,43369462014426,454388947033525, 4762556310357090,49907461663171892, 523040952733010374] |