n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 8 |
5 | 24 |
6 | 85 |
7 | 286 |
8 | 1008 |
9 | 3536 |
10 | 12618 |
11 | 45220 |
12 | 163504 |
13 | 594320 |
14 | 2173197 |
15 | 7983990 |
16 | 29465440 |
17 | 109174560 |
18 | 405995326 |
19 | 1514797020 |
20 | 5669021488 |
21 | 21275014800 |
22 | 80047272578 |
23 | 301892460012 |
24 | 1141069157408 |
25 | 4321730134624 |
26 | 16399422757300 |
[1,2,8,24,85,286,1008,3536,12618,45220,163504, 594320,2173197,7983990,29465440,109174560, 405995326,1514797020,5669021488,21275014800, 80047272578,301892460012,1141069157408, 4321730134624,16399422757300] |