n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 66 |
4 | 504 |
5 | 5040 |
6 | 60840 |
7 | 839160 |
8 | 12882240 |
9 | 217607040 |
10 | 4018896000 |
11 | 80691811200 |
12 | 1750850640000 |
13 | 40809559190400 |
14 | 1016150162227200 |
15 | 26898872647046400 |
16 | 753882642267955200 |
17 | 22291971504503500800 |
18 | 693356807039126630400 |
[1,3,12,66,504,5040,60840,839160,12882240, 217607040,4018896000,80691811200,1750850640000, 40809559190400,1016150162227200,26898872647046400, 753882642267955200,22291971504503500800, 693356807039126630400] |