The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 138 |
| 4 | 22815 |
| 5 | 29197989 |
| 6 | 286181094816 |
| 7 | 21712697070199704 |
| 8 | 12980080058620326927885 |
| 9 | 62082385554465497895132149640 |
| 10 | 2405193620328895144597707267893468286 |
| 11 | 762399006478986275307113015668690102196187810 |
[1,6,138,22815,29197989,286181094816, 21712697070199704,12980080058620326927885, 62082385554465497895132149640, 2405193620328895144597707267893468286, 762399006478986275307113015668690102196187810] |