n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 8 |
6 | 38 |
7 | 192 |
8 | 1320 |
9 | 10176 |
10 | 91296 |
11 | 908160 |
12 | 9985920 |
13 | 119761920 |
14 | 1556847360 |
15 | 21794734080 |
16 | 326920043520 |
17 | 5230700052480 |
18 | 88921882828800 |
19 | 1600593472880640 |
20 | 30411275613143040 |
21 | 608225502973132800 |
[1,1,1,3,8,38,192,1320,10176,91296,908160,9985920, 119761920,1556847360,21794734080,326920043520, 5230700052480,88921882828800,1600593472880640, 30411275613143040,608225502973132800] |