The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 48 |
| 5 | 397 |
| 6 | 4046 |
| 7 | 50562 |
| 8 | 725875 |
| 9 | 11870670 |
| 10 | 219522591 |
| 11 | 4530707851 |
| 12 | 103448006539 |
| 13 | 2595528068368 |
| 14 | 71042542549939 |
[2,3,9,48,397,4046,50562,725875,11870670, 219522591,4530707851,103448006539,2595528068368, 71042542549939] |