Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 8 |
5 | 20 |
6 | 65 |
7 | 189 |
8 | 545 |
9 | 1672 |
10 | 5234 |
11 | 16483 |
12 | 52508 |
13 | 168948 |
14 | 547031 |
15 | 1782892 |
16 | 5851234 |
17 | 19308826 |
18 | 64012154 |
19 | 213130527 |
20 | 712361672 |
21 | 2389177656 |
22 | 8038552120 |
23 | 27125159211 |
24 | 91774118484 |
25 | 311265968741 |
26 | 1058099992873 |
27 | 3604394906225 |
[1,1,1,4,8,20,65,189,545,1672,5234,16483,52508, 168948,547031,1782892,5851234,19308826,64012154, 213130527,712361672,2389177656,8038552120, 27125159211,91774118484,311265968741, 1058099992873,3604394906225] |