| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 81 |
| 4 | 547 |
| 5 | 4244 |
| 6 | 31791 |
| 7 | 242602 |
| 8 | 1838579 |
| 9 | 13941719 |
| 10 | 105949190 |
| 11 | 804555155 |
| 12 | 6108373537 |
| 13 | 46382778115 |
| 14 | 352202493024 |
| 15 | 2674392958960 |
| 16 | 20307546721207 |
| 17 | 154201699487668 |
| 18 | 1170902185284561 |
| 19 | 8891038271677518 |
| 20 | 67512544345698850 |
[1,9,81,547,4244,31791,242602,1838579,13941719, 105949190,804555155,6108373537,46382778115, 352202493024,2674392958960,20307546721207, 154201699487668,1170902185284561,8891038271677518, 67512544345698850] |