The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 9 |
| 5 | 17 |
| 6 | 18 |
| 7 | 82 |
| 8 | 146 |
| 9 | 209 |
| 10 | 408 |
| 11 | 1113 |
| 12 | 1540 |
| 13 | 3294 |
| 14 | 7076 |
| 15 | 11308 |
| 16 | 10940 |
| 17 | 39014 |
| 18 | 46470 |
| 19 | 109780 |
[1,2,2,9,17,18,82,146,209,408,1113,1540,3294,7076, 11308,10940,39014,46470,109780] |