The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 60 |
| 4 | 542 |
| 5 | 4826 |
| 6 | 43359 |
| 7 | 397093 |
| 8 | 3677641 |
| 9 | 34316162 |
| 10 | 321993007 |
| 11 | 3035059323 |
| 12 | 28710966351 |
| 13 | 272413818120 |
| 14 | 2591276923548 |
[0,6,60,542,4826,43359,397093,3677641,34316162, 321993007,3035059323,28710966351,272413818120, 2591276923548] |