n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 44 |
5 | 360 |
6 | 3744 |
7 | 46200 |
8 | 662864 |
9 | 10838016 |
10 | 198943200 |
11 | 4050937440 |
12 | 90613710912 |
13 | 2208677328000 |
14 | 58265734055424 |
15 | 1653914478303360 |
16 | 50263564166365440 |
17 | 1628300694034022400 |
18 | 56012708047907510784 |
19 | 2039053421375533094400 |
20 | 78314004507947110456320 |
[1,0,2,6,44,360,3744,46200,662864,10838016, 198943200,4050937440,90613710912,2208677328000, 58265734055424,1653914478303360,50263564166365440, 1628300694034022400,56012708047907510784, 2039053421375533094400,78314004507947110456320] |