n | a(n) |
---|---|
1 | 2 |
2 | 6 |
3 | 18 |
4 | 52 |
5 | 145 |
6 | 402 |
7 | 1092 |
8 | 2976 |
9 | 8100 |
10 | 22020 |
11 | 59873 |
12 | 162744 |
13 | 442403 |
14 | 1202600 |
15 | 3269010 |
16 | 8886096 |
17 | 24154943 |
18 | 65659968 |
19 | 178482295 |
20 | 485165180 |
21 | 1318815729 |
22 | 3584912826 |
23 | 9744803438 |
24 | 26489122128 |
25 | 72004899325 |
26 | 195729609426 |
[2,6,18,52,145,402,1092,2976,8100,22020,59873, 162744,442403,1202600,3269010,8886096,24154943, 65659968,178482295,485165180,1318815729, 3584912826,9744803438,26489122128,72004899325, 195729609426] |