n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 19 |
3 | 91 |
4 | 427 |
5 | 1963 |
6 | 8875 |
7 | 39595 |
8 | 174763 |
9 | 764587 |
10 | 3320491 |
11 | 14330539 |
12 | 61516459 |
13 | 262843051 |
14 | 1118481067 |
15 | 4742359723 |
16 | 20043180715 |
17 | 84467690155 |
18 | 355050629803 |
19 | 1488921995947 |
20 | 6230565890731 |
21 | 26021775190699 |
22 | 108485147273899 |
[1,4,19,91,427,1963,8875,39595,174763,764587, 3320491,14330539,61516459,262843051,1118481067, 4742359723,20043180715,84467690155,355050629803, 1488921995947,6230565890731,26021775190699, 108485147273899] |