The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 108 |
| 4 | 2612 |
| 5 | 85298 |
| 6 | 3501504 |
| 7 | 172989880 |
| 8 | 9987924928 |
| 9 | 659768790882 |
| 10 | 49065577842538 |
| 11 | 4056413252138692 |
| 12 | 369030922581806616 |
| 13 | 36634832808175143734 |
| 14 | 3940779041158898056286 |
| 15 | 456592594401713997379344 |
[1,1,7,108,2612,85298,3501504,172989880, 9987924928,659768790882,49065577842538, 4056413252138692,369030922581806616, 36634832808175143734,3940779041158898056286, 456592594401713997379344] |