n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 45 |
4 | 322 |
5 | 2730 |
6 | 26004 |
7 | 268554 |
8 | 2940080 |
9 | 33635316 |
10 | 398300344 |
11 | 4849845000 |
12 | 60429982144 |
13 | 767721774800 |
14 | 9916427702880 |
15 | 129937069996965 |
16 | 1724052965464890 |
17 | 23129299114182030 |
18 | 313351935000465900 |
19 | 4282621342230699930 |
20 | 58994556159403576140 |
21 | 818487022124443918740 |
[1,2,8,45,322,2730,26004,268554,2940080,33635316, 398300344,4849845000,60429982144,767721774800, 9916427702880,129937069996965,1724052965464890, 23129299114182030,313351935000465900, 4282621342230699930,58994556159403576140, 818487022124443918740] |