n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 16 |
4 | 60 |
5 | 258 |
6 | 1247 |
7 | 6686 |
8 | 39371 |
9 | 252688 |
10 | 1756920 |
11 | 13168178 |
12 | 105949517 |
13 | 911834394 |
14 | 8367625793 |
15 | 81642384468 |
16 | 844718036940 |
17 | 9245285569526 |
18 | 106790005796627 |
19 | 1298920385093126 |
20 | 16602066548692623 |
[1,2,5,16,60,258,1247,6686,39371,252688,1756920, 13168178,105949517,911834394,8367625793, 81642384468,844718036940,9245285569526, 106790005796627,1298920385093126, 16602066548692623] |