Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 18 |
4 | 74 |
5 | 303 |
6 | 1206 |
7 | 4741 |
8 | 18466 |
9 | 71463 |
10 | 274879 |
11 | 1051509 |
12 | 4001727 |
13 | 15157935 |
14 | 57170668 |
15 | 214787989 |
16 | 804049797 |
17 | 2999846236 |
18 | 11156943967 |
19 | 41370989836 |
20 | 152973793900 |
21 | 564117250793 |
22 | 2074959664189 |
23 | 7613615954760 |
24 | 27871659379578 |
25 | 101805487967357 |
26 | 371072295698710 |
[1,1,4,18,74,303,1206,4741,18466,71463,274879, 1051509,4001727,15157935,57170668,214787989, 804049797,2999846236,11156943967,41370989836, 152973793900,564117250793,2074959664189, 7613615954760,27871659379578,101805487967357, 371072295698710] |