n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 5 |
7 | 14 |
8 | 42 |
9 | 90 |
10 | 207 |
11 | 407 |
12 | 858 |
13 | 1638 |
14 | 3341 |
15 | 6330 |
16 | 12750 |
17 | 24174 |
18 | 48467 |
19 | 92207 |
20 | 184566 |
21 | 352506 |
22 | 705201 |
23 | 1351825 |
24 | 2703880 |
25 | 5200000 |
26 | 10400275 |
27 | 20057949 |
28 | 40116222 |
29 | 77558354 |
30 | 155117085 |
31 | 300539730 |
32 | 601079894 |
33 | 1166802582 |
34 | 2333605659 |
35 | 4537567055 |
36 | 9075134670 |
37 | 17672631234 |
38 | 35345263097 |
39 | 68923263669 |
40 | 137846528040 |
41 | 269128936400 |
42 | 538257873579 |
[1,1,0,0,0,5,14,42,90,207,407,858,1638,3341,6330, 12750,24174,48467,92207,184566,352506,705201, 1351825,2703880,5200000,10400275,20057949, 40116222,77558354,155117085,300539730,601079894, 1166802582,2333605659,4537567055,9075134670, 17672631234,35345263097,68923263669,137846528040, 269128936400,538257873579] |