n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 47 |
3 | 219 |
4 | 985 |
5 | 4377 |
6 | 19367 |
7 | 85563 |
8 | 377809 |
9 | 1667913 |
10 | 7362815 |
11 | 32501499 |
12 | 143469289 |
13 | 633305241 |
14 | 2795546423 |
15 | 12340141851 |
16 | 54472026145 |
17 | 240451163913 |
18 | 1061402800463 |
19 | 4685258655387 |
20 | 20681732329081 |
21 | 91293583386777 |
[1,9,47,219,985,4377,19367,85563,377809,1667913, 7362815,32501499,143469289,633305241,2795546423, 12340141851,54472026145,240451163913, 1061402800463,4685258655387,20681732329081, 91293583386777] |