n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 3 |
6 | 9 |
7 | 23 |
8 | 85 |
9 | 375 |
10 | 2149 |
11 | 15299 |
12 | 129877 |
13 | 1353943 |
14 | 17475557 |
15 | 279267939 |
16 | 5511590965 |
17 | 133957241929 |
18 | 4003924495735 |
19 | 147542199515841 |
20 | 6704016396279819 |
21 | 375798793326385295 |
22 | 25965634034447375655 |
[1,1,1,1,3,9,23,85,375,2149,15299,129877,1353943, 17475557,279267939,5511590965,133957241929, 4003924495735,147542199515841,6704016396279819, 375798793326385295,25965634034447375655] |