The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 12 |
| 4 | 200 |
| 5 | 2660 |
| 6 | 31850 |
| 7 | 361985 |
| 8 | 3982799 |
| 9 | 42914655 |
| 10 | 455727689 |
| 11 | 4788989458 |
| 12 | 49930700093 |
| 13 | 517443017072 |
| 14 | 5336861879564 |
[0,0,12,200,2660,31850,361985,3982799,42914655, 455727689,4788989458,49930700093,517443017072, 5336861879564] |