The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 122 |
| 3 | 1222 |
| 4 | 4615 |
| 5 | 12222 |
| 6 | 122222 |
| 7 | 402046 |
| 8 | 603069 |
| 9 | 869041 |
| 10 | 1222222 |
| 11 | 12222222 |
| 12 | 55887353 |
| 13 | 122222222 |
| 14 | 1222222222 |
| 15 | 3672179309 |
| 16 | 5007665212 |
| 17 | 5248419783 |
| 18 | 5731222831 |
| 19 | 7699085901 |
| 20 | 12222222222 |
| 21 | 122222222222 |
| 22 | 320016003248 |
[12,122,1222,4615,12222,122222,402046,603069, 869041,1222222,12222222,55887353,122222222, 1222222222,3672179309,5007665212,5248419783, 5731222831,7699085901,12222222222,122222222222, 320016003248] |