n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 40 |
6 | 182 |
7 | 906 |
8 | 5404 |
9 | 35494 |
10 | 264178 |
11 | 2124078 |
12 | 18965372 |
13 | 181080940 |
14 | 1879988162 |
15 | 20764521072 |
16 | 246377199752 |
17 | 3085635516364 |
18 | 41182472709986 |
19 | 577129788232678 |
20 | 8552244962978250 |
21 | 132591961730782524 |
22 | 2161198867136837458 |
[1,2,4,12,40,182,906,5404,35494,264178,2124078, 18965372,181080940,1879988162,20764521072, 246377199752,3085635516364,41182472709986, 577129788232678,8552244962978250, 132591961730782524,2161198867136837458] |