Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 60 |
5 | 196 |
6 | 644 |
7 | 2128 |
8 | 7178 |
9 | 24374 |
10 | 83496 |
11 | 288420 |
12 | 1002272 |
13 | 3503748 |
14 | 12311818 |
15 | 43458316 |
16 | 154038006 |
17 | 548018604 |
18 | 1956263020 |
19 | 7004845080 |
20 | 25153186956 |
21 | 90554989440 |
22 | 326790211458 |
23 | 1181910952584 |
24 | 4283416505940 |
25 | 15553332981066 |
26 | 56575492155764 |
27 | 206136324338908 |
[1,2,6,20,60,196,644,2128,7178,24374,83496,288420, 1002272,3503748,12311818,43458316,154038006, 548018604,1956263020,7004845080,25153186956, 90554989440,326790211458,1181910952584, 4283416505940,15553332981066,56575492155764, 206136324338908] |