n | a(n) |
---|---|
1 | 2 |
2 | 3 |
3 | 7 |
4 | 31 |
5 | 181 |
6 | 1621 |
7 | 19441 |
8 | 311041 |
9 | 6842881 |
10 | 171072001 |
11 | 4961088001 |
12 | 153793728001 |
13 | 5382780480001 |
14 | 252990682560001 |
15 | 14420468905920001 |
16 | 879648603261120001 |
17 | 58056807815233920001 |
18 | 4586487817403479680001 |
19 | 371505513209681854080001 |
20 | 40122595426645640240640001 |
[2,3,7,31,181,1621,19441,311041,6842881,171072001, 4961088001,153793728001,5382780480001, 252990682560001,14420468905920001, 879648603261120001,58056807815233920001, 4586487817403479680001,371505513209681854080001, 40122595426645640240640001] |