n | a(n) |
---|---|
4 | 0 |
5 | 1 |
6 | 6 |
7 | 35 |
8 | 168 |
9 | 807 |
10 | 3738 |
11 | 17326 |
12 | 79909 |
13 | 369330 |
14 | 1709087 |
15 | 7929590 |
16 | 36880231 |
17 | 171981241 |
18 | 804008476 |
19 | 3767969067 |
20 | 17699758030 |
21 | 83328230588 |
22 | 393123455667 |
23 | 1858351021018 |
24 | 8801159427825 |
25 | 41756067216508 |
26 | 198437454009869 |
27 | 944521139813575 |
28 | 4502419756667924 |
[0,1,6,35,168,807,3738,17326,79909,369330,1709087, 7929590,36880231,171981241,804008476,3767969067, 17699758030,83328230588,393123455667, 1858351021018,8801159427825,41756067216508, 198437454009869,944521139813575,4502419756667924] |