n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 30 |
4 | 320 |
5 | 4380 |
6 | 73152 |
7 | 1443008 |
8 | 32837632 |
9 | 846829008 |
10 | 24406425600 |
11 | 777438110240 |
12 | 27122380259328 |
13 | 1028481186011968 |
14 | 42119646804852736 |
15 | 1852697321086064640 |
16 | 87113569172046479360 |
17 | 4360314205952755126528 |
18 | 231474221309788621111296 |
19 | 12990330117363343153415680 |
[1,1,4,30,320,4380,73152,1443008,32837632, 846829008,24406425600,777438110240,27122380259328, 1028481186011968,42119646804852736, 1852697321086064640,87113569172046479360, 4360314205952755126528,231474221309788621111296, 12990330117363343153415680] |