n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 20 |
5 | 42 |
6 | 90 |
7 | 191 |
8 | 405 |
9 | 857 |
10 | 1816 |
11 | 3848 |
12 | 8150 |
13 | 17263 |
14 | 36564 |
15 | 77445 |
16 | 164031 |
17 | 347423 |
18 | 735855 |
19 | 1558567 |
20 | 3301098 |
21 | 6991839 |
22 | 14808952 |
23 | 31365865 |
24 | 66433969 |
25 | 140709405 |
26 | 298027302 |
27 | 631231956 |
28 | 1336970739 |
29 | 2831749467 |
30 | 5997741619 |
31 | 12703420605 |
32 | 26906276616 |
[1,2,4,9,20,42,90,191,405,857,1816,3848,8150, 17263,36564,77445,164031,347423,735855,1558567, 3301098,6991839,14808952,31365865,66433969, 140709405,298027302,631231956,1336970739, 2831749467,5997741619,12703420605,26906276616] |