n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 20 |
5 | 15700 |
6 | 161520 |
7 | 659739168 |
8 | 11887243200 |
9 | 115875912594352 |
10 | 1360481062410358294032 |
11 | 40999220870977029249072 |
12 | 1854483563489396099991763032000 |
13 | 106016408292727234808287504322403328 |
[1,1,4,20,15700,161520,659739168,11887243200, 115875912594352,1360481062410358294032, 40999220870977029249072, 1854483563489396099991763032000, 106016408292727234808287504322403328] |