The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 92 |
| 5 | 581 |
| 6 | 4989 |
| 7 | 54250 |
| 8 | 776877 |
| 9 | 14503255 |
| 10 | 356467268 |
| 11 | 11553201879 |
| 12 | 495106836021 |
[1,2,5,17,92,581,4989,54250,776877,14503255, 356467268,11553201879,495106836021] |