n | a(n) |
---|---|
6 | 1 |
7 | 0 |
8 | 15 |
9 | 70 |
10 | 432 |
11 | 4320 |
12 | 30855 |
13 | 294840 |
14 | 2883240 |
15 | 28175952 |
16 | 310690800 |
17 | 3458941920 |
18 | 40459730640 |
19 | 499638948480 |
20 | 6324655705200 |
21 | 83653192972800 |
22 | 1145266802114400 |
23 | 16145338385736000 |
24 | 235579813593453000 |
25 | 3535776409508703360 |
26 | 54571687068401395200 |
27 | 866268656574795936000 |
[1,0,15,70,432,4320,30855,294840,2883240,28175952, 310690800,3458941920,40459730640,499638948480, 6324655705200,83653192972800,1145266802114400, 16145338385736000,235579813593453000, 3535776409508703360,54571687068401395200, 866268656574795936000] |