n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 18 |
3 | 52 |
4 | 277 |
5 | 1752 |
6 | 12120 |
7 | 88692 |
8 | 674751 |
9 | 5282160 |
10 | 42267384 |
11 | 344152080 |
12 | 2842055359 |
13 | 23746693240 |
14 | 200383750632 |
15 | 1705243729560 |
16 | 14617677294675 |
17 | 126106202849760 |
18 | 1094034474058488 |
19 | 9538676631305712 |
20 | 83536778390997780 |
21 | 734521734171474400 |
22 | 6481894477750488160 |
[0,0,18,52,277,1752,12120,88692,674751,5282160, 42267384,344152080,2842055359,23746693240, 200383750632,1705243729560,14617677294675, 126106202849760,1094034474058488,9538676631305712, 83536778390997780,734521734171474400, 6481894477750488160] |