The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 18 |
| 5 | 234 |
| 6 | 7020 |
| 7 | 498420 |
| 8 | 84731400 |
| 9 | 34655142600 |
| 10 | 34169970603600 |
| 11 | 81290360065964400 |
| 12 | 466769247498767584800 |
| 13 | 6469888539580417492912800 |
| 14 | 216495410311439930147848113600 |
| 15 | 17489148731189051877133614160948800 |
| 16 | 3410838720448876031389860235353200668800 |
[1,1,3,18,234,7020,498420,84731400,34655142600, 34169970603600,81290360065964400, 466769247498767584800,6469888539580417492912800, 216495410311439930147848113600, 17489148731189051877133614160948800, 3410838720448876031389860235353200668800] |