The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 1 |
| 6 | 3 |
| 7 | 3 |
| 8 | 13 |
| 9 | 12 |
| 10 | 139 |
| 11 | 65 |
| 12 | 25894 |
| 13 | 24316 |
| 14 | 92798256 |
| 15 | 122859802 |
| 16 | 4366600209354 |
[1,1,2,2,1,3,3,13,12,139,65,25894,24316,92798256, 122859802,4366600209354] |