n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 12 |
4 | 64 |
5 | 320 |
6 | 1568 |
7 | 7616 |
8 | 36864 |
9 | 178176 |
10 | 860672 |
11 | 4156416 |
12 | 20070400 |
13 | 96911360 |
14 | 467935232 |
15 | 2259402752 |
16 | 10909384704 |
17 | 52675215360 |
18 | 254338531328 |
19 | 1228055248896 |
20 | 5929575645184 |
21 | 28630524624896 |
[0,0,2,12,64,320,1568,7616,36864,178176,860672, 4156416,20070400,96911360,467935232,2259402752, 10909384704,52675215360,254338531328, 1228055248896,5929575645184,28630524624896] |