n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 14 |
3 | 84 |
4 | 360 |
5 | 2160 |
6 | 10080 |
7 | 60480 |
8 | 249984 |
9 | 1499904 |
10 | 6999552 |
11 | 41997312 |
12 | 179988480 |
13 | 1079930880 |
14 | 5039677440 |
15 | 30238064640 |
16 | 122903101440 |
17 | 737418608640 |
18 | 3441286840320 |
19 | 20647721041920 |
20 | 88490233036800 |
21 | 530941398220800 |
22 | 2477726525030400 |
23 | 14866359150182400 |
[1,3,14,84,360,2160,10080,60480,249984,1499904, 6999552,41997312,179988480,1079930880,5039677440, 30238064640,122903101440,737418608640, 3441286840320,20647721041920,88490233036800, 530941398220800,2477726525030400, 14866359150182400] |