n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 4 |
4 | 6 |
5 | 12 |
6 | 20 |
7 | 40 |
8 | 70 |
9 | 140 |
10 | 252 |
11 | 504 |
12 | 924 |
13 | 1848 |
14 | 3432 |
15 | 6864 |
16 | 12870 |
17 | 25740 |
18 | 48620 |
19 | 97240 |
20 | 184756 |
21 | 369512 |
22 | 705432 |
23 | 1410864 |
24 | 2704156 |
25 | 5408312 |
26 | 10400600 |
27 | 20801200 |
28 | 40116600 |
29 | 80233200 |
30 | 155117520 |
31 | 310235040 |
32 | 601080390 |
33 | 1202160780 |
[1,2,2,4,6,12,20,40,70,140,252,504,924,1848,3432, 6864,12870,25740,48620,97240,184756,369512,705432, 1410864,2704156,5408312,10400600,20801200, 40116600,80233200,155117520,310235040,601080390, 1202160780] |