n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 12 |
4 | 24 |
5 | 33 |
6 | 60 |
7 | 99 |
8 | 156 |
9 | 276 |
10 | 438 |
11 | 597 |
12 | 1134 |
13 | 1404 |
14 | 2904 |
15 | 3522 |
16 | 6876 |
17 | 7548 |
18 | 16680 |
19 | 18153 |
20 | 39846 |
21 | 41805 |
[1,3,6,12,24,33,60,99,156,276,438,597,1134,1404, 2904,3522,6876,7548,16680,18153,39846,41805] |