n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 1 |
4 | 4 |
5 | 15 |
6 | 62 |
7 | 257 |
8 | 1384 |
9 | 7679 |
10 | 50522 |
11 | 346113 |
12 | 2702764 |
13 | 22022143 |
14 | 199360982 |
15 | 1881735169 |
16 | 19391512144 |
17 | 207983607807 |
18 | 2404879675442 |
19 | 28880901505025 |
20 | 370371188237524 |
21 | 4922617151619071 |
22 | 69348874393137902 |
23 | 1010501269355233281 |
[1,2,1,4,15,62,257,1384,7679,50522,346113,2702764, 22022143,199360982,1881735169,19391512144, 207983607807,2404879675442,28880901505025, 370371188237524,4922617151619071, 69348874393137902,1010501269355233281] |