n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 10 |
3 | 50 |
4 | 266 |
5 | 1452 |
6 | 8073 |
7 | 45460 |
8 | 258434 |
9 | 1479986 |
10 | 8525205 |
11 | 49342636 |
12 | 286721450 |
13 | 1671668520 |
14 | 9774222930 |
15 | 57291319170 |
16 | 336537958394 |
17 | 1980643375180 |
18 | 11676498649312 |
19 | 68940592625476 |
20 | 407593403738856 |
21 | 2412749904577020 |
[1,2,10,50,266,1452,8073,45460,258434,1479986, 8525205,49342636,286721450,1671668520,9774222930, 57291319170,336537958394,1980643375180, 11676498649312,68940592625476,407593403738856, 2412749904577020] |