The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 891 |
| 5 | 9891 |
| 6 | 13391 |
| 7 | 131833 |
| 8 | 197917 |
| 9 | 993891 |
| 10 | 1173833 |
| 11 | 1178891 |
| 12 | 1331833 |
| 13 | 1837917 |
| 14 | 1931833 |
| 15 | 13318333 |
| 16 | 13331833 |
| 17 | 19318333 |
| 18 | 117787917 |
| 19 | 133318333 |
| 20 | 193318333 |
| 21 | 199971833 |
| 22 | 879733891 |
| 23 | 1333183333 |
| 24 | 1333318333 |
| 25 | 1837878891 |
| 26 | 1933183333 |
| 27 | 1998333891 |
| 28 | 3737883333 |
| 29 | 8819398391 |
| 30 | 8879178891 |
| 31 | 9938913391 |
| 32 | 9999191833 |
| 33 | 13333183333 |
[1,3,9,891,9891,13391,131833,197917,993891, 1173833,1178891,1331833,1837917,1931833,13318333, 13331833,19318333,117787917,133318333,193318333, 199971833,879733891,1333183333,1333318333, 1837878891,1933183333,1998333891,3737883333, 8819398391,8879178891,9938913391,9999191833, 13333183333] |