The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 12 |
| 4 | 131 |
| 5 | 143 |
| 6 | 1561 |
| 7 | 1704 |
| 8 | 18601 |
| 9 | 20305 |
| 10 | 221651 |
| 11 | 241956 |
| 12 | 2641211 |
| 13 | 2883167 |
| 14 | 31472881 |
| 15 | 34356048 |
| 16 | 375033361 |
| 17 | 409389409 |
| 18 | 4468927451 |
| 19 | 4878316860 |
| 20 | 53252096051 |
| 21 | 58130412911 |
| 22 | 634556225161 |
| 23 | 692686638072 |
| 24 | 7561422605881 |
| 25 | 8254109243953 |
| 26 | 90102515045411 |
[1,1,11,12,131,143,1561,1704,18601,20305,221651, 241956,2641211,2883167,31472881,34356048, 375033361,409389409,4468927451,4878316860, 53252096051,58130412911,634556225161,692686638072, 7561422605881,8254109243953,90102515045411] |