n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 14 |
6 | 42 |
7 | 133 |
8 | 440 |
9 | 1510 |
10 | 5347 |
11 | 19459 |
12 | 72561 |
13 | 276616 |
14 | 1076236 |
15 | 4268236 |
16 | 17238623 |
17 | 70858091 |
18 | 296293158 |
19 | 1260044245 |
20 | 5449129205 |
21 | 23962691920 |
22 | 107160352895 |
23 | 487379459886 |
24 | 2254710459801 |
25 | 10611155135759 |
26 | 50808249311687 |
27 | 247538711398811 |
[1,1,1,2,5,14,42,133,440,1510,5347,19459,72561, 276616,1076236,4268236,17238623,70858091, 296293158,1260044245,5449129205,23962691920, 107160352895,487379459886,2254710459801, 10611155135759,50808249311687,247538711398811] |