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 | 3 |
| 3 | 9 |
| 4 | 45 |
| 5 | 135 |
| 6 | 945 |
| 7 | 2835 |
| 8 | 14175 |
| 9 | 155925 |
| 10 | 467775 |
| 11 | 6081075 |
[1,3,9,45,135,945,2835,14175,155925,467775, 6081075] |