n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 23 |
6 | 63 |
7 | 178 |
8 | 514 |
9 | 1515 |
10 | 4545 |
11 | 13827 |
12 | 42540 |
13 | 132124 |
14 | 413741 |
15 | 1304891 |
16 | 4141198 |
17 | 13214815 |
18 | 42375461 |
19 | 136478383 |
20 | 441285890 |
21 | 1431925180 |
22 | 4661485203 |
23 | 15219836738 |
24 | 49827678840 |
25 | 163535624722 |
26 | 537962562453 |
27 | 1773437280323 |
[1,1,2,4,9,23,63,178,514,1515,4545,13827,42540, 132124,413741,1304891,4141198,13214815,42375461, 136478383,441285890,1431925180,4661485203, 15219836738,49827678840,163535624722,537962562453, 1773437280323] |