n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 15 |
4 | 128 |
5 | 1310 |
6 | 15864 |
7 | 222936 |
8 | 3572736 |
9 | 64354608 |
10 | 1287495360 |
11 | 28328889600 |
12 | 679936896000 |
13 | 17678878214400 |
14 | 495015296025600 |
15 | 14850552286080000 |
16 | 475219068007219200 |
17 | 16157470542709708800 |
18 | 581669316147767500800 |
19 | 22103440771676298854400 |
[0,2,15,128,1310,15864,222936,3572736,64354608, 1287495360,28328889600,679936896000, 17678878214400,495015296025600,14850552286080000, 475219068007219200,16157470542709708800, 581669316147767500800,22103440771676298854400] |