The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 43 |
| 6 | 150 |
| 7 | 617 |
| 8 | 3050 |
| 9 | 18059 |
| 10 | 125930 |
| 11 | 1013553 |
| 12 | 9246862 |
| 13 | 94226123 |
| 14 | 1059882190 |
| 15 | 13035332841 |
[1,1,2,5,14,43,150,617,3050,18059,125930,1013553, 9246862,94226123,1059882190,13035332841] |