n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 33 |
5 | 145 |
6 | 715 |
7 | 3801 |
8 | 21889 |
9 | 140001 |
10 | 974803 |
11 | 6947017 |
12 | 50720417 |
13 | 421135793 |
14 | 3950147227 |
15 | 33562929817 |
16 | 240061039105 |
17 | 2672302901185 |
18 | 45695167547043 |
19 | 388308372326665 |
20 | -1858226878271967 |
21 | 9709607588675537 |
[1,1,3,9,33,145,715,3801,21889,140001,974803, 6947017,50720417,421135793,3950147227,33562929817, 240061039105,2672302901185,45695167547043, 388308372326665,-1858226878271967, 9709607588675537] |