n | a(n) |
---|---|
2 | 2 |
3 | 12 |
4 | 110 |
5 | 1274 |
6 | 17136 |
7 | 255816 |
8 | 4124406 |
9 | 70549050 |
10 | 1264752060 |
11 | 23555382240 |
12 | 452806924752 |
13 | 8939481277552 |
14 | 180551099694400 |
15 | 3719061442253520 |
16 | 77933728043586630 |
17 | 1658001861319441050 |
18 | 35749633305661575300 |
19 | 780123576993991461000 |
20 | 17208112644166765652100 |
[2,12,110,1274,17136,255816,4124406,70549050, 1264752060,23555382240,452806924752,8939481277552, 180551099694400,3719061442253520, 77933728043586630,1658001861319441050, 35749633305661575300,780123576993991461000, 17208112644166765652100] |