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 | 2 |
| 4 | 6 |
| 5 | 20 |
| 6 | 105 |
| 7 | 726 |
| 8 | 7827 |
| 9 | 127611 |
| 10 | 3166349 |
| 11 | 115369643 |
| 12 | 5981665266 |
[1,1,2,6,20,105,726,7827,127611,3166349,115369643, 5981665266] |