n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 24 |
3 | 182 |
4 | 1200 |
5 | 7502 |
6 | 45864 |
7 | 277622 |
8 | 1672800 |
9 | 10057502 |
10 | 60406104 |
11 | 362617862 |
12 | 2176246800 |
13 | 13059091502 |
14 | 78359364744 |
15 | 470170602902 |
16 | 2821066795200 |
17 | 16926530173502 |
18 | 101559568985784 |
19 | 609358577224742 |
20 | 3656154952230000 |
[0,2,24,182,1200,7502,45864,277622,1672800, 10057502,60406104,362617862,2176246800, 13059091502,78359364744,470170602902, 2821066795200,16926530173502,101559568985784, 609358577224742,3656154952230000] |