n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 7 |
6 | 22 |
7 | 67 |
8 | 215 |
9 | 692 |
10 | 2283 |
11 | 7599 |
12 | 25631 |
13 | 87211 |
14 | 299386 |
15 | 1035059 |
16 | 3602083 |
17 | 12606318 |
18 | 44344764 |
19 | 156698081 |
20 | 555989604 |
21 | 1980050697 |
22 | 7075365521 |
23 | 25360341963 |
24 | 91155701023 |
25 | 328500571740 |
26 | 1186656421109 |
27 | 4296084607302 |
[0,1,1,1,3,7,22,67,215,692,2283,7599,25631,87211, 299386,1035059,3602083,12606318,44344764, 156698081,555989604,1980050697,7075365521, 25360341963,91155701023,328500571740, 1186656421109,4296084607302] |