n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 11 |
5 | 51 |
6 | 291 |
7 | 1971 |
8 | 15411 |
9 | 136371 |
10 | 1345971 |
11 | 14651571 |
12 | 174318771 |
13 | 2249992371 |
14 | 31309422771 |
15 | 467200878771 |
16 | 7441464174771 |
17 | 126003940206771 |
18 | 2260128508782771 |
19 | 42808495311726771 |
20 | 853775831370606771 |
21 | 17884089888607086771 |
22 | 392550999147809646771 |
[0,1,3,11,51,291,1971,15411,136371,1345971, 14651571,174318771,2249992371,31309422771, 467200878771,7441464174771,126003940206771, 2260128508782771,42808495311726771, 853775831370606771,17884089888607086771, 392550999147809646771] |