n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 18 |
4 | 68 |
5 | 244 |
6 | 880 |
7 | 3228 |
8 | 11905 |
9 | 43966 |
10 | 162498 |
11 | 600984 |
12 | 2222776 |
13 | 8218022 |
14 | 30368708 |
15 | 112162230 |
16 | 414006377 |
17 | 1527214022 |
18 | 5630258676 |
19 | 20744334800 |
20 | 76387507859 |
21 | 281129870088 |
22 | 1034103899368 |
23 | 3801934437930 |
24 | 13971364199298 |
25 | 51318841190524 |
26 | 188420580871859 |
[1,2,5,18,68,244,880,3228,11905,43966,162498, 600984,2222776,8218022,30368708,112162230, 414006377,1527214022,5630258676,20744334800, 76387507859,281129870088,1034103899368, 3801934437930,13971364199298,51318841190524, 188420580871859] |