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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 35 |
| 6 | 135 |
| 7 | 613 |
| 8 | 3624 |
| 9 | 25230 |
| 10 | 203640 |
| 11 | 1842350 |
| 12 | 18535683 |
| 13 | 204650313 |
[1,1,2,5,13,35,135,613,3624,25230,203640,1842350, 18535683,204650313] |