n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 45 |
5 | 147 |
6 | 497 |
7 | 1643 |
8 | 5490 |
9 | 18252 |
10 | 60812 |
11 | 202364 |
12 | 673915 |
13 | 2243295 |
14 | 7468973 |
15 | 24865272 |
16 | 82783967 |
17 | 275605513 |
18 | 917563193 |
19 | 3054785032 |
20 | 10170143277 |
21 | 33858882922 |
22 | 112724577088 |
23 | 375287739083 |
24 | 1249425198725 |
25 | 4159643200494 |
26 | 13848474406054 |
27 | 46104972636634 |
28 | 153494780854254 |
[1,1,4,13,45,147,497,1643,5490,18252,60812,202364, 673915,2243295,7468973,24865272,82783967, 275605513,917563193,3054785032,10170143277, 33858882922,112724577088,375287739083, 1249425198725,4159643200494,13848474406054, 46104972636634,153494780854254] |