n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 24 |
7 | 48 |
8 | 0 |
9 | 4032 |
10 | 17280 |
11 | 5400 |
12 | 0 |
13 | 518400 |
14 | 415134720 |
15 | 0 |
16 | 0 |
17 | 1797120 |
18 | 6467044147200 |
19 | 39086530560 |
20 | 0 |
21 | 0 |
22 | 1738201006080000 |
23 | 10247897088 |
24 | 0 |
25 | 9632530575360000 |
26 | 706822057112371200000 |
27 | 569299069913333760000 |
28 | 0 |
29 | 54538738974720000 |
30 | 0 |
[0,0,1,2,4,24,48,0,4032,17280,5400,0,518400, 415134720,0,0,1797120,6467044147200,39086530560,0, 0,1738201006080000,10247897088,0,9632530575360000, 706822057112371200000,569299069913333760000,0, 54538738974720000,0] |