n | a(n) |
---|---|
3 | 0 |
4 | 1 |
5 | 4 |
6 | 2 |
7 | 6 |
8 | 24 |
9 | 28 |
10 | 70 |
11 | 220 |
12 | 418 |
13 | 1079 |
14 | 3229 |
15 | 7816 |
16 | 20030 |
17 | 54017 |
18 | 137231 |
19 | 351289 |
20 | 913028 |
21 | 2360630 |
22 | 6135502 |
23 | 16039333 |
24 | 42102137 |
25 | 110891643 |
26 | 292830804 |
27 | 775990286 |
28 | 2060703746 |
29 | 5481264472 |
30 | 14616590748 |
31 | 39049205927 |
[0,1,4,2,6,24,28,70,220,418,1079,3229,7816,20030, 54017,137231,351289,913028,2360630,6135502, 16039333,42102137,110891643,292830804,775990286, 2060703746,5481264472,14616590748,39049205927] |