n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 13 |
4 | 54 |
5 | 257 |
6 | 1384 |
7 | 8303 |
8 | 54674 |
9 | 390943 |
10 | 3009943 |
11 | 24782522 |
12 | 216985032 |
13 | 2010748246 |
14 | 19641718283 |
15 | 201551129440 |
[2,4,13,54,257,1384,8303,54674,390943,3009943, 24782522,216985032,2010748246,19641718283, 201551129440] |