n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 80 |
5 | 800 |
6 | 10752 |
7 | 181888 |
8 | 3714048 |
9 | 88915968 |
10 | 2442936320 |
11 | 75776712704 |
12 | 2619618852864 |
13 | 99879826948096 |
14 | 4163954627051520 |
15 | 188441538173337600 |
16 | 9200521811924615168 |
17 | 482067547423055544320 |
18 | 26980938272912248406016 |
[1,2,4,12,80,800,10752,181888,3714048,88915968, 2442936320,75776712704,2619618852864, 99879826948096,4163954627051520, 188441538173337600,9200521811924615168, 482067547423055544320,26980938272912248406016] |