n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 11 |
4 | 40 |
5 | 177 |
6 | 934 |
7 | 5665 |
8 | 39064 |
9 | 301209 |
10 | 2572314 |
11 | 24156365 |
12 | 247234332 |
13 | 2751134557 |
14 | 33003190406 |
15 | 426920246945 |
16 | 5905698391952 |
17 | 87530592395793 |
18 | 1378247307547506 |
19 | 23127717388170197 |
20 | 409930747848171812 |
[1,2,4,11,40,177,934,5665,39064,301209,2572314, 24156365,247234332,2751134557,33003190406, 426920246945,5905698391952,87530592395793, 1378247307547506,23127717388170197, 409930747848171812] |