The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 38 |
| 3 | 262 |
| 4 | 4254 |
| 5 | 90054 |
| 6 | 4056794 |
| 7 | 264173146 |
| 8 | 33067061342 |
| 9 | 6424488086390 |
[0,38,262,4254,90054,4056794,264173146, 33067061342,6424488086390] |