n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 6 |
3 | 12 |
4 | 90 |
5 | 360 |
6 | 2040 |
7 | 10080 |
8 | 54810 |
9 | 290640 |
10 | 1588356 |
11 | 8676360 |
12 | 47977776 |
13 | 266378112 |
14 | 1488801600 |
15 | 8355739392 |
16 | 47104393050 |
17 | 266482019232 |
18 | 1512589408044 |
19 | 8610448069080 |
20 | 49144928795820 |
21 | 281164160225520 |
22 | 1612061452900080 |
23 | 9261029179733760 |
24 | 53299490722049520 |
[1,0,6,12,90,360,2040,10080,54810,290640,1588356, 8676360,47977776,266378112,1488801600,8355739392, 47104393050,266482019232,1512589408044, 8610448069080,49144928795820,281164160225520, 1612061452900080,9261029179733760, 53299490722049520] |