The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 6 |
| 4 | 13 |
| 5 | 15 |
| 6 | 20 |
| 7 | 34 |
| 8 | 83 |
| 9 | 174 |
| 10 | 246 |
| 11 | 911 |
| 12 | 1065 |
| 13 | 1084 |
| 14 | 1455 |
| 15 | 1490 |
| 16 | 1546 |
| 17 | 3674 |
| 18 | 8644 |
| 19 | 9556 |
| 20 | 15287 |
| 21 | 15378 |
| 22 | 15826 |
| 23 | 25670 |
[2,5,6,13,15,20,34,83,174,246,911,1065,1084,1455, 1490,1546,3674,8644,9556,15287,15378,15826,25670] |