The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 32 |
| 4 | 161 |
| 5 | 736 |
| 6 | 3416 |
| 7 | 15976 |
| 8 | 74295 |
| 9 | 345334 |
| 10 | 1605089 |
| 11 | 7455698 |
| 12 | 34623338 |
| 13 | 160759047 |
| 14 | 746318897 |
| 15 | 3464508951 |
| 16 | 16081935250 |
| 17 | 74648713406 |
[2,7,32,161,736,3416,15976,74295,345334,1605089, 7455698,34623338,160759047,746318897,3464508951, 16081935250,74648713406] |