n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 7 |
4 | 25 |
5 | 121 |
6 | 1561 |
7 | 9871 |
8 | 101137 |
9 | 1293265 |
10 | 15765841 |
11 | 226501111 |
12 | 3355388521 |
13 | 55348183177 |
14 | 981791212585 |
15 | 19611613003711 |
16 | 387083895223201 |
17 | 8241127257050401 |
18 | 193814428658623777 |
19 | 4572332597344204135 |
20 | 116627907470591924281 |
21 | 3142752742361513926681 |
[1,1,1,7,25,121,1561,9871,101137,1293265,15765841, 226501111,3355388521,55348183177,981791212585, 19611613003711,387083895223201,8241127257050401, 193814428658623777,4572332597344204135, 116627907470591924281,3142752742361513926681] |