n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 31 |
5 | 129 |
6 | 651 |
7 | 3913 |
8 | 27399 |
9 | 219201 |
10 | 1972819 |
11 | 19728201 |
12 | 217010223 |
13 | 2604122689 |
14 | 33853594971 |
15 | 473950329609 |
16 | 7109254944151 |
17 | 113748079106433 |
18 | 1933717344809379 |
19 | 34806912206568841 |
20 | 661331331924807999 |
21 | 13226626638496160001 |
22 | 277759159408419360043 |
[1,1,3,9,31,129,651,3913,27399,219201,1972819, 19728201,217010223,2604122689,33853594971, 473950329609,7109254944151,113748079106433, 1933717344809379,34806912206568841, 661331331924807999,13226626638496160001, 277759159408419360043] |