Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 7 |
7 | 21 |
8 | 55 |
9 | 263 |
10 | 1645 |
11 | 13423 |
12 | 126629 |
13 | 1447199 |
14 | 21743065 |
15 | 415978809 |
16 | 9965909653 |
17 | 303132585251 |
18 | 11591760284391 |
19 | 555704916934105 |
20 | 33613901189599473 |
21 | 2574475177790739409 |
[1,1,1,1,1,7,21,55,263,1645,13423,126629,1447199, 21743065,415978809,9965909653,303132585251, 11591760284391,555704916934105,33613901189599473, 2574475177790739409] |