n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 6 |
5 | 30 |
6 | 180 |
7 | 840 |
8 | 5460 |
9 | 30996 |
10 | 209160 |
11 | 1290960 |
12 | 9753480 |
13 | 69618120 |
14 | 571627056 |
15 | 4443697440 |
16 | 40027718640 |
17 | 346953934320 |
18 | 3369416698080 |
19 | 31421601510336 |
20 | 328430320909920 |
21 | 3331475969159520 |
22 | 37124416523261760 |
[0,0,0,6,30,180,840,5460,30996,209160,1290960, 9753480,69618120,571627056,4443697440,40027718640, 346953934320,3369416698080,31421601510336, 328430320909920,3331475969159520, 37124416523261760] |