The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 483 |
| 5 | 16205 |
| 6 | 430078 |
| 7 | 10210206 |
| 8 | 228926441 |
| 9 | 4979392831 |
| 10 | 106552681812 |
| 11 | 2260112122016 |
| 12 | 47713890438655 |
| 13 | 1004771692065345 |
| 14 | 21130651257100970 |
| 15 | 444074589574292578 |
| 16 | 9329140064903065365 |
| 17 | 195950323696361689667 |
| 18 | 4115367075816142112512 |
| 19 | 86427075922333935342372 |
[0,0,8,483,16205,430078,10210206,228926441, 4979392831,106552681812,2260112122016, 47713890438655,1004771692065345,21130651257100970, 444074589574292578,9329140064903065365, 195950323696361689667,4115367075816142112512, 86427075922333935342372] |