n | a(n) |
---|---|
4 | 1 |
5 | 20 |
6 | 300 |
7 | 4200 |
8 | 58800 |
9 | 846720 |
10 | 12700800 |
11 | 199584000 |
12 | 3293136000 |
13 | 57081024000 |
14 | 1038874636800 |
15 | 19833061248000 |
16 | 396661224960000 |
17 | 8299373322240000 |
18 | 181400588328960000 |
19 | 4135933413900288000 |
20 | 98228418580131840000 |
21 | 2426819753156198400000 |
22 | 62288373664342425600000 |
[1,20,300,4200,58800,846720,12700800,199584000, 3293136000,57081024000,1038874636800, 19833061248000,396661224960000,8299373322240000, 181400588328960000,4135933413900288000, 98228418580131840000,2426819753156198400000, 62288373664342425600000] |