The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 93 |
| 4 | 1135 |
| 5 | 18567 |
| 6 | 387976 |
| 7 | 9991794 |
| 8 | 308837454 |
| 9 | 11225560583 |
| 10 | 472141867849 |
[1,2,11,93,1135,18567,387976,9991794,308837454, 11225560583,472141867849] |