n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 30 |
4 | 288 |
5 | 3480 |
6 | 50400 |
7 | 851760 |
8 | 16450560 |
9 | 357436800 |
10 | 8629286400 |
11 | 229162348800 |
12 | 6638962176000 |
13 | 208362342988800 |
14 | 7042436719718400 |
15 | 255029193619200000 |
16 | 9851119008546816000 |
17 | 404305986955014144000 |
18 | 17569457946995834880000 |
19 | 805912049524456562688000 |
[0,1,4,30,288,3480,50400,851760,16450560, 357436800,8629286400,229162348800,6638962176000, 208362342988800,7042436719718400, 255029193619200000,9851119008546816000, 404305986955014144000,17569457946995834880000, 805912049524456562688000] |