The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 22 |
| 5 | 101 |
| 6 | 202 |
| 7 | 444 |
| 8 | 525 |
| 9 | 828 |
| 10 | 1111 |
| 11 | 2222 |
| 12 | 4884 |
| 13 | 5445 |
| 14 | 5775 |
| 15 | 12321 |
| 16 | 13431 |
| 17 | 18081 |
| 18 | 21612 |
| 19 | 24642 |
| 20 | 26862 |
| 21 | 31213 |
| 22 | 44244 |
| 23 | 44844 |
| 24 | 51415 |
| 25 | 52425 |
| 26 | 56265 |
| 27 | 62426 |
| 28 | 80008 |
| 29 | 86868 |
| 30 | 89298 |
| 31 | 99099 |
| 32 | 135531 |
| 33 | 162261 |
| 34 | 198891 |
| 35 | 217712 |
| 36 | 237732 |
| 37 | 301103 |
| 38 | 343343 |
| 39 | 480084 |
| 40 | 486684 |
| 41 | 512215 |
| 42 | 521125 |
[1,2,11,22,101,202,444,525,828,1111,2222,4884, 5445,5775,12321,13431,18081,21612,24642,26862, 31213,44244,44844,51415,52425,56265,62426,80008, 86868,89298,99099,135531,162261,198891,217712, 237732,301103,343343,480084,486684,512215,521125] |