n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 32 |
5 | 130 |
6 | 652 |
7 | 3914 |
8 | 27400 |
9 | 219202 |
10 | 1972820 |
11 | 19728202 |
12 | 217010224 |
13 | 2604122690 |
14 | 33853594972 |
15 | 473950329610 |
16 | 7109254944152 |
17 | 113748079106434 |
18 | 1933717344809380 |
19 | 34806912206568842 |
20 | 661331331924808000 |
21 | 13226626638496160002 |
22 | 277759159408419360044 |
[1,2,4,10,32,130,652,3914,27400,219202,1972820, 19728202,217010224,2604122690,33853594972, 473950329610,7109254944152,113748079106434, 1933717344809380,34806912206568842, 661331331924808000,13226626638496160002, 277759159408419360044] |