n | a(n) |
---|---|
1 | 2 |
2 | 5 |
3 | 18 |
4 | 84 |
5 | 480 |
6 | 3240 |
7 | 25200 |
8 | 221760 |
9 | 2177280 |
10 | 23587200 |
11 | 279417600 |
12 | 3592512000 |
13 | 49816166400 |
14 | 741015475200 |
15 | 11769069312000 |
16 | 198766503936000 |
17 | 3556874280960000 |
18 | 67224923910144000 |
19 | 1338096104497152000 |
20 | 27978373094031360000 |
21 | 613091306060513280000 |
[2,5,18,84,480,3240,25200,221760,2177280,23587200, 279417600,3592512000,49816166400,741015475200, 11769069312000,198766503936000,3556874280960000, 67224923910144000,1338096104497152000, 27978373094031360000,613091306060513280000] |