n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 51 |
5 | 189 |
6 | 709 |
7 | 2683 |
8 | 10220 |
9 | 39130 |
10 | 150438 |
11 | 580328 |
12 | 2245004 |
13 | 8705686 |
14 | 33828704 |
15 | 131688362 |
16 | 513445147 |
17 | 2004688605 |
18 | 7836832057 |
19 | 30670416703 |
20 | 120153739079 |
21 | 471143251989 |
22 | 1848978071615 |
23 | 7261781367389 |
24 | 28540427527441 |
25 | 112243216215879 |
26 | 441693646453729 |
[1,1,4,14,51,189,709,2683,10220,39130,150438, 580328,2245004,8705686,33828704,131688362, 513445147,2004688605,7836832057,30670416703, 120153739079,471143251989,1848978071615, 7261781367389,28540427527441,112243216215879, 441693646453729] |