n | a(n) |
---|---|
0 | 3 |
1 | 20 |
2 | 117 |
3 | 682 |
4 | 3975 |
5 | 23168 |
6 | 135033 |
7 | 787030 |
8 | 4587147 |
9 | 26735852 |
10 | 155827965 |
11 | 908231938 |
12 | 5293563663 |
13 | 30853150040 |
14 | 179825336577 |
15 | 1048098869422 |
16 | 6108767879955 |
17 | 35604508410308 |
18 | 207518282581893 |
19 | 1209505187081050 |
20 | 7049512839904407 |
[3,20,117,682,3975,23168,135033,787030,4587147, 26735852,155827965,908231938,5293563663, 30853150040,179825336577,1048098869422, 6108767879955,35604508410308,207518282581893, 1209505187081050,7049512839904407] |