n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 14 |
3 | 88 |
4 | 566 |
5 | 3722 |
6 | 24856 |
7 | 167868 |
8 | 1143462 |
9 | 7841434 |
10 | 54065574 |
11 | 374437404 |
12 | 2602879712 |
13 | 18150990238 |
14 | 126918338116 |
15 | 889551010728 |
16 | 6247598686710 |
17 | 43958881741086 |
18 | 309801915943318 |
19 | 2186512103767096 |
20 | 15452093394793006 |
[1,2,14,88,566,3722,24856,167868,1143462,7841434, 54065574,374437404,2602879712,18150990238, 126918338116,889551010728,6247598686710, 43958881741086,309801915943318,2186512103767096, 15452093394793006] |