n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 22 |
5 | 57 |
6 | 154 |
7 | 429 |
8 | 1223 |
9 | 3550 |
10 | 10455 |
11 | 31160 |
12 | 93802 |
13 | 284789 |
14 | 871008 |
15 | 2681019 |
16 | 8298933 |
17 | 25817396 |
18 | 80674902 |
19 | 253106837 |
20 | 796968056 |
21 | 2517706037 |
22 | 7977573203 |
23 | 25347126630 |
24 | 80738862085 |
25 | 257778971504 |
26 | 824798533933 |
[1,2,4,9,22,57,154,429,1223,3550,10455,31160, 93802,284789,871008,2681019,8298933,25817396, 80674902,253106837,796968056,2517706037, 7977573203,25347126630,80738862085,257778971504, 824798533933] |