n | a(n) |
---|---|
1 | 2 |
2 | 6 |
3 | 18 |
4 | 50 |
5 | 142 |
6 | 390 |
7 | 1086 |
8 | 2958 |
9 | 8134 |
10 | 22050 |
11 | 60146 |
12 | 162466 |
13 | 440750 |
14 | 1187222 |
15 | 3208298 |
16 | 8622666 |
17 | 23233338 |
18 | 62329366 |
19 | 167558310 |
20 | 448848582 |
21 | 1204403014 |
22 | 3222280242 |
23 | 8633306906 |
24 | 23073198658 |
25 | 61740677454 |
26 | 164856393110 |
27 | 440658745814 |
[2,6,18,50,142,390,1086,2958,8134,22050,60146, 162466,440750,1187222,3208298,8622666,23233338, 62329366,167558310,448848582,1204403014, 3222280242,8633306906,23073198658,61740677454, 164856393110,440658745814] |