The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 9 |
| 4 | 38 |
| 5 | 100 |
| 6 | 316 |
| 7 | 1217 |
| 8 | 8004 |
| 9 | 52464 |
| 10 | 501170 |
| 11 | 4720512 |
| 12 | 60221097 |
| 13 | 817581575 |
[1,5,9,38,100,316,1217,8004,52464,501170,4720512, 60221097,817581575] |