n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 15 |
4 | 73 |
5 | 537 |
6 | 3899 |
7 | 35623 |
8 | 345553 |
9 | 3767185 |
10 | 44993331 |
11 | 575013087 |
12 | 8040614041 |
13 | 118459611753 |
14 | 1883371991531 |
15 | 31449522256183 |
16 | 558550869727393 |
17 | 10410156829764769 |
18 | 204093418753532259 |
19 | 4191381846930998319 |
20 | 89889103856588434921 |
[1,1,3,15,73,537,3899,35623,345553,3767185, 44993331,575013087,8040614041,118459611753, 1883371991531,31449522256183,558550869727393, 10410156829764769,204093418753532259, 4191381846930998319,89889103856588434921] |