n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 14 |
6 | 43 |
7 | 142 |
8 | 475 |
9 | 1640 |
10 | 5774 |
11 | 20682 |
12 | 74911 |
13 | 274392 |
14 | 1014155 |
15 | 3778158 |
16 | 14170988 |
17 | 53471322 |
18 | 202835554 |
19 | 773073462 |
20 | 2958951714 |
21 | 11368816862 |
22 | 43832643969 |
23 | 169531531422 |
24 | 657591743743 |
25 | 2557480816940 |
26 | 9970749112046 |
27 | 38960285199980 |
28 | 152554056890622 |
[2,1,2,5,14,43,142,475,1640,5774,20682,74911, 274392,1014155,3778158,14170988,53471322, 202835554,773073462,2958951714,11368816862, 43832643969,169531531422,657591743743, 2557480816940,9970749112046,38960285199980, 152554056890622] |