n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 16 |
4 | 114 |
5 | 866 |
6 | 7188 |
7 | 65580 |
8 | 655872 |
9 | 7157376 |
10 | 84775680 |
11 | 1084343040 |
12 | 14906039040 |
13 | 219267751680 |
14 | 3437854963200 |
15 | 57247256424960 |
16 | 1009189972869120 |
17 | 18779054120386560 |
18 | 367876307230064640 |
19 | 7568437652936294400 |
20 | 163164173556503347200 |
21 | 3678547646214424166400 |
[0,0,2,16,114,866,7188,65580,655872,7157376, 84775680,1084343040,14906039040,219267751680, 3437854963200,57247256424960,1009189972869120, 18779054120386560,367876307230064640, 7568437652936294400,163164173556503347200, 3678547646214424166400] |