n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 24 |
3 | 140 |
4 | 816 |
5 | 4756 |
6 | 27720 |
7 | 161564 |
8 | 941664 |
9 | 5488420 |
10 | 31988856 |
11 | 186444716 |
12 | 1086679440 |
13 | 6333631924 |
14 | 36915112104 |
15 | 215157040700 |
16 | 1254027132096 |
17 | 7309005751876 |
18 | 42600007379160 |
19 | 248291038523084 |
20 | 1447146223759344 |
21 | 8434586304032980 |
[0,4,24,140,816,4756,27720,161564,941664,5488420, 31988856,186444716,1086679440,6333631924, 36915112104,215157040700,1254027132096, 7309005751876,42600007379160,248291038523084, 1447146223759344,8434586304032980] |