n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 40 |
4 | 226 |
5 | 1380 |
6 | 8880 |
7 | 59280 |
8 | 406416 |
9 | 2842400 |
10 | 20186752 |
11 | 145119616 |
12 | 1053575336 |
13 | 7711639760 |
14 | 56834201280 |
15 | 421327859520 |
16 | 3139306406850 |
17 | 23494847031300 |
18 | 176526280319120 |
19 | 1330929290036560 |
20 | 10065855468854980 |
21 | 76341682531733960 |
22 | 580460500453098080 |
[1,2,8,40,226,1380,8880,59280,406416,2842400, 20186752,145119616,1053575336,7711639760, 56834201280,421327859520,3139306406850, 23494847031300,176526280319120,1330929290036560, 10065855468854980,76341682531733960, 580460500453098080] |