n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 33 |
5 | 139 |
6 | 718 |
7 | 4535 |
8 | 35979 |
9 | 363083 |
10 | 4717687 |
11 | 79501654 |
12 | 1744252509 |
13 | 49872339897 |
14 | 1856792610995 |
15 | 89847422244493 |
16 | 5637294117525695 |
[1,1,3,9,33,139,718,4535,35979,363083,4717687, 79501654,1744252509,49872339897,1856792610995, 89847422244493,5637294117525695] |