n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 6 |
4 | 28 |
5 | 160 |
6 | 1036 |
7 | 7294 |
8 | 54548 |
9 | 426960 |
10 | 3463304 |
11 | 28910816 |
12 | 247104976 |
13 | 2154192248 |
14 | 19097610480 |
15 | 171769942086 |
16 | 1564484503044 |
17 | 14407366963440 |
18 | 133978878618904 |
19 | 1256799271555872 |
20 | 11881860129979440 |
[1,2,2,6,28,160,1036,7294,54548,426960,3463304, 28910816,247104976,2154192248,19097610480, 171769942086,1564484503044,14407366963440, 133978878618904,1256799271555872, 11881860129979440] |