n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 34 |
5 | 146 |
6 | 752 |
7 | 4520 |
8 | 31062 |
9 | 240188 |
10 | 2063846 |
11 | 19508770 |
12 | 201184666 |
13 | 2247704104 |
14 | 27044622168 |
15 | 348654862510 |
16 | 4794539357488 |
17 | 70054014476102 |
18 | 1083796147054274 |
19 | 17698938549553490 |
20 | 304247125951777284 |
[1,2,4,10,34,146,752,4520,31062,240188,2063846, 19508770,201184666,2247704104,27044622168, 348654862510,4794539357488,70054014476102, 1083796147054274,17698938549553490, 304247125951777284] |