n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 6 |
4 | 21 |
5 | 47 |
6 | 134 |
7 | 323 |
8 | 876 |
9 | 2224 |
10 | 5885 |
11 | 15146 |
12 | 39574 |
13 | 102250 |
14 | 265574 |
15 | 686208 |
16 | 1775646 |
17 | 4583718 |
18 | 11835037 |
19 | 30515520 |
20 | 78652647 |
[1,4,6,21,47,134,323,876,2224,5885,15146,39574, 102250,265574,686208,1775646,4583718,11835037, 30515520,78652647] |