n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 42 |
4 | 244 |
5 | 1504 |
6 | 9656 |
7 | 63856 |
8 | 431872 |
9 | 2972778 |
10 | 20756036 |
11 | 146627648 |
12 | 1046060836 |
13 | 7525452296 |
14 | 54530660832 |
15 | 397628393728 |
16 | 2915496099136 |
17 | 21481907631872 |
18 | 158975372309176 |
19 | 1181109256858096 |
20 | 8806197969093184 |
[1,2,8,42,244,1504,9656,63856,431872,2972778, 20756036,146627648,1046060836,7525452296, 54530660832,397628393728,2915496099136, 21481907631872,158975372309176,1181109256858096, 8806197969093184] |