n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 55 |
3 | 485 |
4 | 4380 |
5 | 39570 |
6 | 421800 |
7 | 4265100 |
8 | 49455000 |
9 | 594001800 |
10 | 7784683200 |
11 | 107814672000 |
12 | 1624964544000 |
13 | 25881953328000 |
14 | 443107288512000 |
15 | 8028628336512000 |
16 | 154539996629760000 |
17 | 3135393617489280000 |
18 | 67045955961922560000 |
19 | 1503619681171829760000 |
20 | 35321502985569884160000 |
[1,5,55,485,4380,39570,421800,4265100,49455000, 594001800,7784683200,107814672000,1624964544000, 25881953328000,443107288512000,8028628336512000, 154539996629760000,3135393617489280000, 67045955961922560000,1503619681171829760000, 35321502985569884160000] |