n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 19 |
5 | 53 |
6 | 153 |
7 | 451 |
8 | 1339 |
9 | 4001 |
10 | 11981 |
11 | 35919 |
12 | 107727 |
13 | 323149 |
14 | 969409 |
15 | 2908187 |
16 | 8724515 |
17 | 26173497 |
18 | 78520437 |
19 | 235561255 |
20 | 706683703 |
[0,1,3,7,19,53,153,451,1339,4001,11981,35919, 107727,323149,969409,2908187,8724515,26173497, 78520437,235561255,706683703] |