n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 8 |
7 | 60 |
8 | 294 |
9 | 1180 |
10 | 4200 |
11 | 13776 |
12 | 42560 |
13 | 125568 |
14 | 357120 |
15 | 985600 |
16 | 2652672 |
17 | 6988800 |
18 | 18077696 |
19 | 46018560 |
20 | 115507200 |
21 | 286326784 |
22 | 701890560 |
23 | 1703411712 |
24 | 4096655360 |
25 | 9771417600 |
26 | 23132110848 |
27 | 54384394240 |
28 | 127049662464 |
29 | 295069286400 |
30 | 681574400000 |
[0,0,0,0,0,0,8,60,294,1180,4200,13776,42560, 125568,357120,985600,2652672,6988800,18077696, 46018560,115507200,286326784,701890560,1703411712, 4096655360,9771417600,23132110848,54384394240, 127049662464,295069286400,681574400000] |