n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 64 |
6 | 384 |
7 | 2544 |
8 | 20352 |
9 | 181632 |
10 | 1816320 |
11 | 19960320 |
12 | 239523840 |
13 | 3113533440 |
14 | 43589468160 |
15 | 653837506560 |
16 | 10461400104960 |
17 | 177843719208960 |
18 | 3201186945761280 |
19 | 60822550297313280 |
20 | 1216451005946265600 |
[1,1,2,4,16,64,384,2544,20352,181632,1816320, 19960320,239523840,3113533440,43589468160, 653837506560,10461400104960,177843719208960, 3201186945761280,60822550297313280, 1216451005946265600] |