The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 41 |
| 2 | 1640 |
| 3 | 65600 |
| 4 | 2624000 |
| 5 | 104960000 |
| 6 | 4198399180 |
| 7 | 167935934400 |
| 8 | 6717436064820 |
| 9 | 268697390145600 |
| 10 | 10747893507936000 |
| 11 | 429915656401920000 |
| 12 | 17196622899456671580 |
| 13 | 687864781713487950000 |
| 14 | 27514585897949409744420 |
[1,41,1640,65600,2624000,104960000,4198399180, 167935934400,6717436064820,268697390145600, 10747893507936000,429915656401920000, 17196622899456671580,687864781713487950000, 27514585897949409744420] |