n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 55 |
3 | 377 |
4 | 2584 |
5 | 17711 |
6 | 121393 |
7 | 832040 |
8 | 5702887 |
9 | 39088169 |
10 | 267914296 |
11 | 1836311903 |
12 | 12586269025 |
13 | 86267571272 |
14 | 591286729879 |
15 | 4052739537881 |
16 | 27777890035288 |
17 | 190392490709135 |
18 | 1304969544928657 |
19 | 8944394323791464 |
20 | 61305790721611591 |
21 | 420196140727489673 |
[1,8,55,377,2584,17711,121393,832040,5702887, 39088169,267914296,1836311903,12586269025, 86267571272,591286729879,4052739537881, 27777890035288,190392490709135,1304969544928657, 8944394323791464,61305790721611591, 420196140727489673] |