n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 40 |
4 | 240 |
5 | 1664 |
6 | 12992 |
7 | 112256 |
8 | 1059840 |
9 | 10827264 |
10 | 118758400 |
11 | 1389711360 |
12 | 17258893312 |
13 | 226463227904 |
14 | 3127694491648 |
15 | 45316785602560 |
16 | 686826595745792 |
17 | 10861264214949888 |
18 | 178802342273744896 |
19 | 3058036745204924416 |
20 | 54236710945813430272 |
21 | 995874184692762673152 |
[1,2,8,40,240,1664,12992,112256,1059840,10827264, 118758400,1389711360,17258893312,226463227904, 3127694491648,45316785602560,686826595745792, 10861264214949888,178802342273744896, 3058036745204924416,54236710945813430272, 995874184692762673152] |