n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 48 |
5 | 400 |
6 | 4140 |
7 | 49644 |
8 | 681296 |
9 | 10515600 |
10 | 180349380 |
11 | 3402380740 |
12 | 70023004920 |
13 | 1561206957336 |
14 | 37485640585484 |
15 | 964345394431020 |
16 | 26462386594676640 |
17 | 771532717446066208 |
18 | 23817889096309943892 |
19 | 776127882633846005268 |
[0,0,2,6,48,400,4140,49644,681296,10515600, 180349380,3402380740,70023004920,1561206957336, 37485640585484,964345394431020,26462386594676640, 771532717446066208,23817889096309943892, 776127882633846005268] |