The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 12 |
| 6 | 21 |
| 7 | 46 |
| 8 | 121 |
| 9 | 162 |
| 10 | 642 |
| 11 | 6642 |
| 12 | 11142 |
| 13 | 664162 |
| 14 | 66641662 |
| 15 | 6664414162 |
| 16 | 6642624666662 |
[1,2,4,11,12,21,46,121,162,642,6642,11142,664162, 66641662,6664414162,6642624666662] |