n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 54 |
6 | 162 |
7 | 486 |
8 | 1394 |
9 | 3991 |
10 | 11593 |
11 | 33772 |
12 | 98320 |
13 | 286072 |
14 | 831952 |
15 | 2418664 |
16 | 7030816 |
17 | 20441944 |
18 | 59441521 |
19 | 172843609 |
20 | 502580846 |
21 | 1461344622 |
22 | 4249102850 |
23 | 12354982862 |
24 | 35924300898 |
25 | 104456501102 |
26 | 303726483778 |
27 | 883140022543 |
[1,2,6,18,54,162,486,1394,3991,11593,33772,98320, 286072,831952,2418664,7030816,20441944,59441521, 172843609,502580846,1461344622,4249102850, 12354982862,35924300898,104456501102,303726483778, 883140022543] |