n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 31 |
4 | 142 |
5 | 659 |
6 | 3113 |
7 | 14918 |
8 | 72199 |
9 | 351983 |
10 | 1726022 |
11 | 8504509 |
12 | 42070429 |
13 | 208812722 |
14 | 1039387519 |
15 | 5186451311 |
16 | 25935769702 |
17 | 129942777227 |
18 | 652133298421 |
19 | 3277734587302 |
20 | 16496741964221 |
21 | 83129076840317 |
22 | 419362231888882 |
[1,2,7,31,142,659,3113,14918,72199,351983,1726022, 8504509,42070429,208812722,1039387519,5186451311, 25935769702,129942777227,652133298421, 3277734587302,16496741964221,83129076840317, 419362231888882] |