n | a(n) |
---|---|
4 | 2 |
5 | 15 |
6 | 60 |
7 | 469 |
8 | 3660 |
9 | 32958 |
10 | 328920 |
11 | 3614490 |
12 | 43341822 |
13 | 563144725 |
14 | 7880897892 |
15 | 118177520295 |
16 | 1890389939000 |
17 | 32130521850972 |
18 | 578260307815920 |
19 | 10985555094348948 |
20 | 219687969344126490 |
21 | 4613039009310624795 |
22 | 101479234383619208204 |
23 | 2333872309936442446905 |
[2,15,60,469,3660,32958,328920,3614490,43341822, 563144725,7880897892,118177520295,1890389939000, 32130521850972,578260307815920,10985555094348948, 219687969344126490,4613039009310624795, 101479234383619208204,2333872309936442446905] |