n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 12 |
4 | 96 |
5 | 1000 |
6 | 13500 |
7 | 221718 |
8 | 4301808 |
9 | 97747200 |
10 | 2555001360 |
11 | 75526842600 |
12 | 2503943418240 |
13 | 92407030642056 |
14 | 3759862792921872 |
15 | 167429488088545200 |
16 | 8120958429706093440 |
17 | 426777425467443381120 |
18 | 24161214872571127574400 |
19 | 1467122583066982481802816 |
[1,1,2,12,96,1000,13500,221718,4301808,97747200, 2555001360,75526842600,2503943418240, 92407030642056,3759862792921872, 167429488088545200,8120958429706093440, 426777425467443381120,24161214872571127574400, 1467122583066982481802816] |