n | a(n) |
---|---|
2 | 3 |
3 | 8 |
4 | 21 |
5 | 54 |
6 | 141 |
7 | 372 |
8 | 995 |
9 | 2697 |
10 | 7397 |
11 | 20502 |
12 | 57347 |
13 | 161658 |
14 | 458788 |
15 | 1309626 |
16 | 3757383 |
17 | 10828011 |
18 | 31326513 |
19 | 90945528 |
[3,8,21,54,141,372,995,2697,7397,20502,57347, 161658,458788,1309626,3757383,10828011,31326513, 90945528] |