The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 77 |
| 3 | 697 |
| 4 | 6497 |
| 5 | 55552 |
| 6 | 512100 |
| 7 | 4710641 |
| 8 | 42205969 |
| 9 | 341224891 |
| 10 | 2787791578 |
| 11 | 22971326749 |
| 12 | 190650687957 |
[0,7,77,697,6497,55552,512100,4710641,42205969, 341224891,2787791578,22971326749,190650687957] |