n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 26 |
4 | 107 |
5 | 468 |
6 | 2141 |
7 | 10124 |
8 | 49101 |
9 | 242934 |
10 | 1221427 |
11 | 6222838 |
12 | 32056215 |
13 | 166690696 |
14 | 873798681 |
15 | 4612654808 |
16 | 24499322137 |
17 | 130830894666 |
18 | 702037771647 |
19 | 3783431872018 |
20 | 20469182526595 |
21 | 111133368084892 |
22 | 605312629105205 |
23 | 3306633429423460 |
24 | 18111655081108453 |
[1,2,7,26,107,468,2141,10124,49101,242934,1221427, 6222838,32056215,166690696,873798681,4612654808, 24499322137,130830894666,702037771647, 3783431872018,20469182526595,111133368084892, 605312629105205,3306633429423460, 18111655081108453] |