n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 3 |
5 | 192 |
6 | 20 |
7 | 11520 |
8 | 315 |
9 | 573440 |
10 | 36288 |
11 | 928972800 |
12 | 1663200 |
13 | 54499737600 |
14 | 74131200 |
15 | 1322526965760 |
16 | 6810804000 |
17 | 228532659683328000 |
18 | 37638881280 |
19 | 16783438527143608320 |
20 | 121645100408832 |
21 | 30370031620545576960000 |
[1,1,4,3,192,20,11520,315,573440,36288,928972800, 1663200,54499737600,74131200,1322526965760, 6810804000,228532659683328000,37638881280, 16783438527143608320,121645100408832, 30370031620545576960000] |