n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 14 |
6 | 50 |
7 | 194 |
8 | 750 |
9 | 2934 |
10 | 11557 |
11 | 46010 |
12 | 184784 |
13 | 748678 |
14 | 3056308 |
15 | 12562908 |
16 | 51952261 |
17 | 216011544 |
18 | 902512979 |
19 | 3787287378 |
20 | 15955748048 |
21 | 67462625834 |
22 | 286172617162 |
23 | 1217561851258 |
24 | 5194521586232 |
[2,1,2,4,14,50,194,750,2934,11557,46010,184784, 748678,3056308,12562908,51952261,216011544, 902512979,3787287378,15955748048,67462625834, 286172617162,1217561851258,5194521586232] |