The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 15 |
| 5 | 314 |
| 6 | 13757 |
| 7 | 1142968 |
| 8 | 178281041 |
| 9 | 52610850316 |
| 10 | 29702573255587 |
| 11 | 32446427369694348 |
| 12 | 69254848513798160815 |
| 13 | 291053505824567573585744 |
| 14 | 2421830049319361003822380177 |
| 15 | 40050220743831370293688592267252 |
| 16 | 1319550593412053164173947687592553185 |
[1,1,1,2,15,314,13757,1142968,178281041, 52610850316,29702573255587,32446427369694348, 69254848513798160815,291053505824567573585744, 2421830049319361003822380177, 40050220743831370293688592267252, 1319550593412053164173947687592553185] |