n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 13 |
4 | 50 |
5 | 203 |
6 | 1154 |
7 | 6627 |
8 | 49356 |
9 | 403293 |
10 | 3858376 |
11 | 33929377 |
12 | 460614670 |
13 | 5168544119 |
14 | 64518640406 |
15 | 946910125319 |
16 | 16124114481720 |
17 | 221243980745433 |
18 | 4261440137319852 |
19 | 68524390012831189 |
20 | 1477309421907315082 |
[1,4,13,50,203,1154,6627,49356,403293,3858376, 33929377,460614670,5168544119,64518640406, 946910125319,16124114481720,221243980745433, 4261440137319852,68524390012831189, 1477309421907315082] |