n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 24 |
4 | 300 |
5 | 4260 |
6 | 69120 |
7 | 1271340 |
8 | 26233200 |
9 | 601246800 |
10 | 15171105600 |
11 | 418203324000 |
12 | 12509695598400 |
13 | 403696590897600 |
14 | 13982667790291200 |
15 | 517482647165484000 |
16 | 20381726051118432000 |
17 | 851302665544050720000 |
18 | 37587618060140244096000 |
19 | 1749369290830388555328000 |
20 | 85599487854917373617280000 |
[0,0,2,24,300,4260,69120,1271340,26233200, 601246800,15171105600,418203324000,12509695598400, 403696590897600,13982667790291200, 517482647165484000,20381726051118432000, 851302665544050720000,37587618060140244096000, 1749369290830388555328000, 85599487854917373617280000] |