The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 20 |
| 4 | 220 |
| 5 | 11110 |
| 6 | 222200 |
| 7 | 20220200 |
| 8 | 2001022100 |
| 9 | 200102210000 |
| 10 | 20211100210000 |
| 11 | 2210002222120000 |
| 12 | 1020101022210200000 |
| 13 | 121001222020102200000 |
| 14 | 22100000121100001100000 |
| 15 | 11122000100002000202000000 |
| 16 | 2202002012101012102212000000 |
| 17 | 1201122101101102102110111000000 |
[1,1,2,20,220,11110,222200,20220200,2001022100, 200102210000,20211100210000,2210002222120000, 1020101022210200000,121001222020102200000, 22100000121100001100000, 11122000100002000202000000, 2202002012101012102212000000, 1201122101101102102110111000000] |