n | a(n) |
---|---|
0 | 2 |
1 | 8 |
2 | 48 |
3 | 320 |
4 | 2176 |
5 | 14848 |
6 | 101376 |
7 | 692224 |
8 | 4726784 |
9 | 32276480 |
10 | 220397568 |
11 | 1504968704 |
12 | 10276569088 |
13 | 70172803072 |
14 | 479169871872 |
15 | 3271976550400 |
16 | 22342453428224 |
17 | 152563815022592 |
18 | 1041770892754944 |
19 | 7113656621858816 |
20 | 48575085832830976 |
21 | 331691433687777280 |
[2,8,48,320,2176,14848,101376,692224,4726784, 32276480,220397568,1504968704,10276569088, 70172803072,479169871872,3271976550400, 22342453428224,152563815022592,1041770892754944, 7113656621858816,48575085832830976, 331691433687777280] |