n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 36 |
3 | 240 |
4 | 1400 |
5 | 7560 |
6 | 38808 |
7 | 192192 |
8 | 926640 |
9 | 4375800 |
10 | 20323160 |
11 | 93117024 |
12 | 421848336 |
13 | 1892909200 |
14 | 8424486000 |
15 | 37228204800 |
16 | 163493866080 |
17 | 714083503320 |
18 | 3103696272600 |
19 | 13431200244000 |
20 | 57895542104400 |
21 | 248675137991280 |
[0,4,36,240,1400,7560,38808,192192,926640,4375800, 20323160,93117024,421848336,1892909200,8424486000, 37228204800,163493866080,714083503320, 3103696272600,13431200244000,57895542104400, 248675137991280] |