n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 6 |
5 | 16 |
6 | 48 |
7 | 140 |
8 | 428 |
9 | 1308 |
10 | 4072 |
11 | 12796 |
12 | 40432 |
13 | 129432 |
14 | 413900 |
15 | 1342580 |
16 | 4335288 |
17 | 14201804 |
18 | 46226896 |
19 | 152594276 |
20 | 500016036 |
21 | 1660630740 |
22 | 5472190206 |
23 | 18264517264 |
24 | 60475691308 |
25 | 202684618564 |
26 | 673892675030 |
27 | 2266436498400 |
28 | 7562707682032 |
29 | 25510762766704 |
30 | 85394319699916 |
[1,2,6,16,48,140,428,1308,4072,12796,40432,129432, 413900,1342580,4335288,14201804,46226896, 152594276,500016036,1660630740,5472190206, 18264517264,60475691308,202684618564,673892675030, 2266436498400,7562707682032,25510762766704, 85394319699916] |