n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 8 |
3 | 24 |
4 | 67 |
5 | 195 |
6 | 580 |
7 | 1730 |
8 | 5179 |
9 | 15533 |
10 | 46578 |
11 | 139712 |
12 | 419115 |
13 | 1257319 |
14 | 3771930 |
15 | 11315764 |
16 | 33947261 |
17 | 101841751 |
18 | 305525228 |
19 | 916575642 |
20 | 2749726883 |
[1,3,8,24,67,195,580,1730,5179,15533,46578,139712, 419115,1257319,3771930,11315764,33947261, 101841751,305525228,916575642,2749726883] |