n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 20 |
5 | 61 |
6 | 182 |
7 | 547 |
8 | 1640 |
9 | 4921 |
10 | 14762 |
11 | 44287 |
12 | 132860 |
13 | 398581 |
14 | 1195742 |
15 | 3587227 |
16 | 10761680 |
17 | 32285041 |
18 | 96855122 |
19 | 290565367 |
20 | 871696100 |
21 | 2615088301 |
22 | 7845264902 |
23 | 23535794707 |
24 | 70607384120 |
25 | 211822152361 |
26 | 635466457082 |
[0,1,2,7,20,61,182,547,1640,4921,14762,44287, 132860,398581,1195742,3587227,10761680,32285041, 96855122,290565367,871696100,2615088301, 7845264902,23535794707,70607384120,211822152361, 635466457082] |