n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 352 |
3 | 6080 |
4 | 104704 |
5 | 1802240 |
6 | 31019008 |
7 | 533872640 |
8 | 9188540416 |
9 | 158144921600 |
10 | 2721848492032 |
11 | 46846013603840 |
12 | 806271544459264 |
13 | 13876822236200960 |
14 | 238835410589974528 |
15 | 4110620744461844480 |
16 | 70748315180918112256 |
17 | 1217656507884193710080 |
18 | 20957211028999804813312 |
[1,20,352,6080,104704,1802240,31019008,533872640, 9188540416,158144921600,2721848492032, 46846013603840,806271544459264,13876822236200960, 238835410589974528,4110620744461844480, 70748315180918112256,1217656507884193710080, 20957211028999804813312] |