n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 12 |
5 | 60 |
6 | 300 |
7 | 1296 |
8 | 5616 |
9 | 28080 |
10 | 155520 |
11 | 883872 |
12 | 5018112 |
13 | 28304640 |
14 | 158130514 |
15 | 878719104 |
16 | 4899999744 |
17 | 27554100480 |
18 | 156139902720 |
19 | 889181991936 |
20 | 5077739844402 |
21 | 29043991855542 |
22 | 166348496793600 |
23 | 954240788994048 |
24 | 5484206701412352 |
25 | 31581437286776820 |
[0,0,2,12,60,300,1296,5616,28080,155520,883872, 5018112,28304640,158130514,878719104,4899999744, 27554100480,156139902720,889181991936, 5077739844402,29043991855542,166348496793600, 954240788994048,5484206701412352, 31581437286776820] |